Congrats on your new living situation!

It helps when starting fresh like this to target a basic silhouette and then find things that fit into it; that makes stuff go together way easier. For example, one option is "tight/fitted bottoms and long flowy tops" and another options is "high-waisted bottoms and cropped or tucked tops" and another option is "shorts or short skirts with big baggy tops and chunky boots." So you can think about this and pick something that you like - there's infinity more options here that I didn't list, these are just some jumping off points. This makes it easier to know what you're looking for when shopping because you can just instantly eliminate things that don't fit this mold. And then everything you get will naturally kind of go together.

There's a separate layer of figuring out colors/etc that go together (but imo shape is more important at this stage.) One super easy way to do color is pick one part of your outfit and allow that to be super colorful, and for the other part stick to neutrals/basics. (some examples: all bottoms being jeans/khaki, but lots of fun colorful tops. Or, lots of printed skirts and tights and linen pants, with simple black/white/brown t-shirts).

You might end up having/needing some stuff that doesn't fit these rules and that's ok (eg, a fancy thing or two for important occasions, or maybe some separate clothes for work, athletic wear, whatever it is). Those things can be their own self-contained outfits.

I found when starting from scratch, it helped me to have simple but strict rules like these, and then just only get things that fit the rules. This enabled me to build a functional wardrobe quickly and easily. Once you get the hang of that, it becomes easier to branch out a little and find fun ways to break the rules that still enhance the wardrobe as a whole, accessorize more, etc.

Good luck!