It honestly depends on the style you are interested in. Subcategories such as eroguro kei would most likely be too much for someone younger, but if you enjoy more colorful things, I would look at oshare kei! I personally am interested in oshare and vkei with a punk twist (i.e. 2000's miyavi). It's easier to gather base pieces such as graphic tees, ripped/colored jeans, etc. Vkei is all about accessories, so you can build off of your basic pieces. you can wear bike chains,collars, wristbands, necklaces, bracelets, hats, etc!
I hope this helped a lil !!