You are ready to add your first item! If you want to draw the items yourself, read the tutorial (from the (?) button) and download your avatar template.
Vestire has a variety of features, primarily an option to import hand-drawn items of clothing that you can organize into separate categories to create looks from, or select from a few basic presets.
You'll have a personalized avatar where you can customize the body type, skin color, hair, and hair color to look just like you, so when you're trying on clothes you don't even have to step into the closet.
Draw your clothing items on separate layers from the avatar layer.
When you're done, export each layer with a transparent background (it should just be the clothing item, not the avatar too!).