Loli + flatboard are basic support of the basic lolicon branches. From there, you can grow additional fetishes depend on your experiences, that often includes the already built in buruma + sukumizu + elementary seifuku + randoseru... fetish.
or you would prefer kemonomimi branches which often in cludes collar as a starting point > build up to S&M
wonder if you go anything further than diaper > urination > scat branches
I'd go purely flat, but all thank to Check & later, Micchi, the boundary has been extended up to C recently, and I don't have intention to go any further than that!