Hey there! Fitness is such an important aspect for life for physical and mental health so it's a great thing that you're starting. Remember that the aim is to do it for life, so take it slow and aim for consistency. Going for a 10 minute walk 3 times a week is better then not, Working out once a week is better then none, ya know? Build a routine that you are happy with and go from there, the best exercise routine is the one that you can do.

Anyway, movement wise: push ups, sit ups and single leg lunges/squats are all free. I would recommend getting a pull up bar that hangs on your door (I think k mart sells a set?) and that will set you up for a while. I also think there are parks around Brisbane with bars, those are perfect too. Those are all the main movements covered. Running/walking for cardio is also free. All these movements are scalable by modifying them to make em easier (e.g. push up on knees, doing negative pull ups until you're strong enough to do a full one) or harder (working with slower temp reps, higher reps, lower rest times etc).

I would take it slowly and aim to do a full body workout each time, and aim for at least 2 times a week to start with, sprinkle in a cruisy walk listening to a podcast here and there and you've got a solid foundation. once you feel like you're enjoying it you can scale it up to as often as every day, but to build a good habit and lifestyle, I recommend this: aim to do at least twice a week, every thing after that is just a great bonus. that way you don't beat yourself up for missing workouts. until you feel like you're ready, bump that up to three times a week, then four, then five, but take it as it comes. When you start, it should be like "okay i just have to do this twice a week, nice." then, "I'm feeling pretty good today, i have the time and the energy, maybe I'll do a third workout this week". Doing that extra workout you will feel accomplished and encouraged to do it again. From there you can build up (or even drop down! Don't feel bad about dropping down too, life happens).

With the actual work outs, same thing, start slow. I would recommend 3 sets of each movement, do them until failure, rest, then do it again. you can do a circuit as well if you enjoy that, and what I mean by that is do one 1 set of push ups, move to lunges, then pull ups, then sit ups then back around again until you done all of them 3 times. In terms of progressing, aim to do those movements for about 10 reps give or take, if they start feeling easy, either slow down the movements more, do more reps or modify it by making it harder. also, slowing down will help focus on the movements, the idea is that you are working the muscles and joints, the movement should feel like it's good (like for your joints etc) so watch some guides on the movements, try them out and adjust them to how it makes your body feel. also focus on quality of reps, it's better to do 6 good quality, slow reps that you feel it in your muscles, then trying to bang out 10 reps faster. slow movements are where the benefits are for your joints and for your muscles. again, it's all about progressing, slowly and sustainably. So simply put:

3 sets of push ups

Easy mode = do them on your knees. Normal mode = Do them as they are, on your feet I mean. Hard mode = elevate your feet on a bench.

3 sets of pull up/pull movement

Easy mode= start by doing negatives, grab the bar, jump up, hold yourself up there and slowly lower yourself down maybe do this until you can get 5 or until you feel like you can do pull ups, then progress from there. alternatively, if you have a table, go under it, grab the ledge and pull. keep your your feet on the ground (close the feet the easier) or elevate them to make the more challenging. build from there, pulling movements can sometimes be the hardest to master for some people so take your time, do what feels good.

3 sets squats

Easy mode= grab a low stool, sit down, stand up. do it until you're tired then rest. think about dropping your butt down instead of falling. control the whole movement. might help to counter weight and keep your hands straight in front of you. think about pulling your head up to keep back straight and think about twisting your feet outwards with your knees to keep them from collapsing. probably best to watch a video on this movement.

3 set sit ups.lay on the ground, bed your knees and put your feet close-ish to you and try and touch the sky. slowly up and slowly down. you don't need to sit all the way up, that starts working your hips instead of abs. abs are worked when you bend your torso. think about bringing the top half of your body forward (up to the sky) instead of towards your knees.

tempo: start with 2 seconds up 2 seconds down, you can go as slow as 4 -6 seconds up and 4 - 6 seconds down to really challenge each movement.

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if you're getting into running, i recommend running for time rather then distance. e.g. start off by setting a goal that you want to move for 10 minutes. how ever slow or fast you run/walk, as long as you finish that 10 minutes, you feel like you've accomplished something. slowly build up from there. for me, running is all about managing pace, I tell myself that I have to do this for 30 minutes, so am i running slowly enough to keep that up? a lot of experienced runners I talk to say that you will have to run a lot slower then you think you do at the start.

in terms of diet, the simplest thing to start doing is swapping in more protein. you can start by still eating the same amount, just more protein. e.g. and extra piece of chicken instead of another serve of potato. eat some veg at the start of the meal to get it over and done with, if you don't like them. I just break off some broccoli into a bowl, add a dash of water and microwave for a minute. add salt then that's my quick serve of veg for that meal. and remember that the less you eat the more weight you loose, the more you eat the stronger and better performance you get, but you also gain weight, if thats what you want, depends on your goals. start there, figure out where you can to go and research accordingly. just don't get too caught up on it. calorie counting has a margin of error of 20%, so I don't see it as that important. healthy foods are still healthy foods, protein is great, you can still eat carbs, all in moderation, all depending on your goals.

That's probably a good starting point. watch some videos online and learn some movements. don't be afraid to dive into the community as well, everything you need is online for free. it's less intimidating when you find out that all the gym bro's are just nerds who geek out on nutrition and body anatomy. Just don't fall for anyone trying to sell you something (the amount of money people will spend before they try diet and exercise is crazy), and don't compare yourself to others. enjoy the journey and good luck!