Hi and welcome!
I would recommend that you familiarize yourself with the guidelines for your body shape, and then begin the closet purge. Both can be found here on the website. I would start with one certain type of clothing, such as tops or pants for example. Try each one on in front of a full-length mirror, and decide if they fit well, follow the guidelines, and are the right color for you. Get rid of anything that doesn't fit well, is old and worn out, is the wrong color, or that you just don't love. Take as much or as little time as you need to do these steps, so that you don't get overwhelmed. Sometimes it helps to take pictures of the clothes on you, to help you see if they are worth keeping.