I'm getting into making islands with UEFN and I'm struggling with a few things

• Vehicles: Are there prefabs? Can I customise them? Can I do it within UEFN itself?
• Brick Editor: Is it really as limited as it looks? I see a lot of pieces used in other builds that aren't in the editor like wheels and SNOT pieces
• Tutorials: A lot of the tutorials I've seen are using the creator mode, and not UEFN. Are there any tutorials specifically for UEFN that I've just missed?
• General tips: Any general tips/tricks for working with the editor

I really appreciate the help!