Going 3d for your first few projects is fine if you keep the scope very limited. If memory serves the FNAF guy picked up fusion and did a very simple game to showcase his janky models before someone suggested he try to do a horror game.
If you don't have a programming background its best you stick with visual scripting and keep your game designs very simple as you get the workflow down. Good projects getting started early with 3d are visual novel games that follow a point a to b with some player choices sprinkled in.
I use 3 different diaper meshes. The one seen in most renders and games is a heavy modified cushy+ https://puddlegum.gumroad.com the puddlegums models are the best ones you can buy at the moments.