Try and make a mood/fashion board.
Pin colours you like or tend to gravitate to, pin photos of outfits and styles you find online or on catwalks to see what you like and what appeals to you. You will probably start to see some kind of colour/cut pattern and start building from there.
If it's thing you are unsure of, go to a bigger department store and just try on the cuts and styles of items you're in to. Maybe you really like cutoff short shorts but you aren't sure if you'd actually like them on you? Try them on! You're under no obligation to buy anything, and in big department stores there is less likely a clerk going to come and ask you how you are doing/make you uncomfortable so you can go at your own pace.
I would also recommend (depending on how much money you have), try to buy things slowly. Impulse buying a bunch of new clothes is always fun, but you never know if you just bought it because it was cute or if you genuinely liked it. So go slow and just buy a couple of top and bottoms to start.
Also with the basics, they really do help tbh. A white, block and grey t-shirt in different cuts (baggy, fitted, 3/4 sleeve, etc) can be really easily used to bring an outfit together because they go with virtually everything and can be put up or down with some shoes or accessories. Same with a nice pair of jeans.