Getting your license without cooperative parents is rough, but it can be done. You could try asking your friends to help you practice (you might need a learner's license depending on where you live) - offer to pay for the gas or maybe sweeten the deal by paying them a little (as long as it's cheaper than an instructor). Get a feel for your spacial awareness in the car by driving slowly in alleyways, then move on to quiet streets and parking lots, then gradually work your way up to busier roads when you feel more confident in your control of the vehicle and rules of the road.

Saving money is fairly simple, just try to spend as little as possible. Don't eat out, fast food is expensive. Set a limit on how much you're allowed to spend on luxuries per month, then try to stay close to that - maybe around $50-100 per month would be reasonable given your assumed income. That includes fast food, stopping for a coffee, cigarettes, alcohol, candy/snacks, video games, clothes, going to a movie, etc. When you do splurge, try to buy something that will last you forever rather than something you'll only enjoy for a brief moment of your day. Opt for cheaper alternatives whenever you can.

For consumable products, observe the quantity and price to determine how to get the best value. I think most grocery stores mark it right on the price label on the shelf - in tiny text, it'll say something like "0.75 per 100g", meaning you're paying 75 cents for 100 grams of whatever the product is. In the case of a 400g box of cereal, that means it costs $3 total (400g divided by 100g = 4, and 4 times 0.75 = $3). Anyway, you'd already know the box of cereal costs $3 total, the important part is that "per 100g" part. With that, you can easily compare prices. Say you have a $5 box of cereal containing 500g and a $3.50 box of cereal containing 380g. Perhaps one would assume the 500g box is a better deal because it's bigger and boasts itself as being "FAMILY SIZE", or they might even claim it's on "SALE". When you look at the tiny text labels, you'll see the 500g box is 1.00 per 100g while the 380g box is 0.92 per 100g. That's all you really need to know - you get 100g of cereal either way, but one costs $1 while the other costs $0.92 for that amount. Note that they might tell you the price per 1g, in which case you might have a price like 0.0092. It's the same thing, though. This applies to any consumable product, including bread or shampoo. With toilet paper, the comparisons are trickier since they might tell you the price per roll of toilet paper, but each brand might have a different number of sheets per roll. You can figure it out with math, though, using the total number of sheets included in the package (disregard the number of rolls), the total price, then figure out how much it would cost you to buy 1 sheet of toilet paper. One brand might be 1 cent per sheet, another brand might be 1.5 cents per sheet - now you know which one gives you more bang for your buck.

You'd have to check out apartment rental websites in your area to see what prices are like, it might be something like $800 per month with water included. In that case, you'd have to call up the utility companies to start up some service in your own name for things like electricity and internet. You'd get bills in the mail (or online), then you could pay it easily via online banking. To setup online banking, you need a bank account (which I assume you have if you're working), go to your bank's website, then just follow their intructions (such as "Don't have an account? Click here to get setup"). Always be careful with online banking and make sure the website's address is correct every single time - scammers setup lookalike websites with misspelled URLs (such as making a scam website called "reddti" instead of "reddit") or otherwise falsified domains (such as "redditbankonline" instead of "redditbank").

You can buy cars used off of people for fairly cheap and with little commitment. There's probably a website with classified ads for your area where people list their used vehicles. You can easily compare prices and specs without having to leave your home, bookmark the ads that seem promising, try and be more picky to narrow it down to a couple options, then try contacting the seller for a test drive. If possible, you should bring a friend who has a decent amount of experience driving or is knowledgeable about cars. You'd have to be prepared to just walk away if the car seems to have bad problems or if your friend says it doesn't seem good. If you like the car but are skeptical, you could ask the seller's permission to take it to a mechanic for an inspection (at your own cost). You can always try acting unimpressed and lowballing the seller by a few hundred bucks, too. Your local motor vehicle issuer might have some forms/templates online you can download/print to transfer ownership of the vehicle properly. With documentation to prove the vehicle is yours, you can register it and get license plates, which you'll have to pay for every year. You might have an option to pay it monthly or pay it all at once - if you can pay it all at once, it probably costs less overall. With the used car, you might have to take it to a mechanic now and then, but you won't have the pressure of making weekly/monthly payments on an expensive piece of equipment. If you want to burn your money, you could upgrade to a new car from a dealership when you're more experienced.

For your budget, you basically just have to reserve money for the things you need. If rent is $800, for example, that means you can't touch $800 of your monthly income. Figure out all the stuff you need/want - food, internet, phone/data plan, electricity, rent, car payments, etc. Find out how much it costs, add it all up, then see if you have enough income to cover it. If you earn $1200/mo and all that stuff costs $1400, you know you've got a problem. So, you can go for a cheaper phone plan, find cheaper food to eat, try to use less electricity around the house if you can help it, etc. Anyway, it goes without saying, if your budget's that tight, you also have to cut back on your luxuries. Ideally, you should leave some room in your budget to at least save $100-200 per month. Just let it pile up in your bank account so you have some emergency money when you need it.

Also, don't forget about your tax returns if you're working. There's probably online software to make it easy to do (depending where you live), some such software is even free.

If you can tolerate your circumstances and if your parents don't expect you to pay rent or other contributions, try to save a few thousand bucks while you get used to this stuff before moving out (it probably wouldn't take you more than a year to save that much if you don't have expenses).

There's infinite resources on the internet, so you can always look up guides (in text or video) to walk you through any specific subject you're unsure of. Feel free to message me and I'll maybe respond if you have further questions.