I know but I learn java and I have no clue of what I need to do. But now I understand a bit better even if it still a bit difficult.
1)
Thanks for the answer, it works fine now. I just need to change the size, sounds, attributes and goal now. I understand a bit what was missing.
The game was crashing but it was because of the rendering who was missing.
2)
I didn't know that and I have do that and I create the folder and the class and now it works perfectly. Thanks you!
I have still a lot of things to learn.
Thanks to you and perromercenary00 too. This is what was missing along with EntityRenderersEvent.RegisterRenderers.