Regarding clothes. Firstly work out what body shape and skin tone you have. (This is easily explained on utube.)
The body shape determines the clothes that will look good on you. Secondly the skin tone determines the colors you can wear.
Thirdly research “layers,” and the rules of 3rds when it comes to fashion. I find Lynda Tomlinson extremely helpful in explaining this.
Once armed with this information, you can confidently shop at generic clothing shops and buy clothing that suits you.