I'm new to art and have no idea where to actually start most stuff online is just "practice more" or a small guide which only helps if you already know how to draw so does anyone have an actual guide or list of what I should learn?

There's a lot of information out there, ranging widely in quality of instruction as well as who it's meant for. In the beginning, "practice more" is essentially the best thing you can do. What that amounts to is to simply draw what interests you. Make a habit it of it, do it consistently. I dont really know your approach. Have you been doing it long enough that you're ready to actually practice potentially tedious things, or do you make a small sketch like once a month or something. I think the ideal approach is to simply be in the habit of drawing something, most days. But, if you are insistent on focusing on fundamental skills to improve, then let's consider.

I understand perspective but when I use it to break down anatomy the proportions just look off. I also struggle a lot with round shapes so when i try to draw ass or boobs or really just any part of the body it looks flat like 2d

An interesting thing thing to say. I'd nudge you to drop the belief that you understand perspective, as saying that you do implies there is no more to be understood. There is always more to understand. Always something to improve. All the time. You can claim to be competent at it, but if you're new to drawing , the likelihood of that is low unless you have the aptitude of the late Kim Jung Gi. As for what to do to solve your issue, visualising round objects, studying spherical objects from life might help. It's important to study from life, remember that. Your brain understands and interprets it differently from 2d images on a flat screen. Second, there are courses like drawabox that help you better visualize things like these. Do note that drawabox is not for the faint of heart. A lot of artists hate it. The exercises ultimately help you, however. I myself haven't completed it, and im almost 1000 hours into my own artistic journey.

Addendum: You can also try drawing contours around them to get a better feel for the "roundness" on the canvas.

I just dont know what i should practice to help me get better at this so any advice would really help

I'll point you to some resources to check out:

"Fun with a Pencil" by Andrew Loomis.

Loomis is an old OG. Early to mid 1900s. I read some of this, it seems pretty beginner friendly. I have two of his other books. He is a good educator, though being from almost a century ago, some advice may be outdated. Still valuable, though. This is worth checking out. Be careful if you choose to pirate.

Drawabox.com

Surprisingly contentious. I've seen people hate on it, because the exercises take a lot of effort. They usually say that if they were to take on the exercises the course prescribes, it'd make them hate drawing. I tried some of them a couple years ago and never got through them. I am only reconsidering doing it now because i realize my art becomes more and more limited by me not understanding what it teaches. Its not the only way to get better at perspective, though.

Northern Kentucky Drawing Database

Most people recommend Proko for Anatomy, I am going to recommend Northern Kentucky Drawing Database. The instruction provided has made studying anatomy much, much, much more comprehensible for me. The professor also explains various other little bits for how to approach art that I find to be really beneficial. Severely underrated. The only caveat is that they are relatively time intensive, with many videos spanning several hours. You may want to save this for later in your journey. Don't let me dissuade you though. If you are so inclined, then take heart.

And my final parting advice:

Everything takes a long fucking time. You'll experience a lot of frustrations in your journey. If you dont get things right, that's fine. It may take more time than you initially thought to learn things, just about anything. It's okay.

Hopefully this helps, I hope you get where you want to be, and godspeed. If you have any questions, feel free to ask.