I know Asm, i know c, c++ but i dont know how make the enemy in the nsmb editor and i dont know how to insert sprite or 3d model. Plis i want help

There’s this thing (I think) that converts 3D models into nsbmd or something, I’ve forgotten what it was called, but I’ll try to remember, for the rest, I've got no clue

Edit: Nitro Model Converter GUI
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maybe this could help? also, while my knowledge of code hacks are rudimentary, i believe youd have to add the model file into the rom and use code hacks to have the game load it.