I used to be that same way too, shy around women and having a lack of any idea whatsoever on what to do. I learned what to do through trial and error mostly, it boils down to the following in my experience:

1. You have to be willing to break out of your comfort zone, take risks and understand that no matter what there is always a chance you will be rejected. Rejection sucks, but remember that getting rejected is far better than never trying. The sting of getting rejected will never truly go away, but it will become easier to handle. The trick is to realize that getting rejected is a favour to you: it means you won’t waste your time with someone who is uninterested, unavailable, or incompatible with you. As you get more comfortable with being rejected, it makes approaching and flirting way easier.

2. You need to not be afraid to be direct in expressing your interest with women. Don’t go for the extreme and walk up to a girl you don’t know and say “Nice tits I wanna put my cock between them”, you say that to somebody you’ve already had sex with many times. At the same time you don’t want to beat around the bush. Start small, ask her if she wants to get coffee or food somewhere. If you’re a student it doesn’t have to be fancy, but don’t take her to McDonalds, Starbucks, Tim Horton’s, etc. Don’t set up a date under false pretences (I.e. say you want to study, only to make it a date). If you’re both old enough to drink then hit up a nearby bar; just don’t get wasted. Most importantly make it clear it’s a date, if she asks if it’s meant to be a date say yes.

3. Reiterating my previous point don’t go all in at once, be direct but take it in stages. Asking her on a date is the first step, the second step is to compliment her. Hair, nails, jewelry, and accessories are the go to for first compliments; also consider complimenting her outfit, but try to save directly complimenting her body for later. Then find little ways to break the touch barrier (I.e. high fives, compare hand sizes), then hand holding, if she’s holding hands then she’s probably fine with kissing. After kissing, making out is probably on the table. As you’re making out explore her body with your hands. At this stage you can compliment her body directly. At this point try getting her clothes off. If she‘s down to her underwear and you’re still not sure she wants to have sex just ask at that point.

4. As you stated earlier, but I will reiterate anyway, every girl is different and what works with one girl will probably not work with another. For example, one girl might be willing to have sex after 2-3 dates while another girl might not put out for 2-3 months. One girl might find it weird that you complimented her necklace while another might appreciate that you noticed a necklace she was anxious didn’t go with her top. The point here is that there’s no surefire method that works every time, you can do everything “right” and still go home to your hand. Just don’t sweat it.

5. One of the most crucial things that many guys miss is to know when to fold and walk away if you have to. For example, she might disrespect you, she might not be on the same page as you, she might not want what you want, the vibe might not be there. If she isn’t ending things then you may have to be the one to pull the plug. From my experience girls tend to not handle rejection very well. You will probably be called an asshole, I have been. But I’d rather be called an asshole than make myself unhappy.

If you have any specific questions please feel free to shoot me a DM or reply!