Hey,
my advice would be to do all the modeling, UVing, texturing, etc. in other programs. Where UE5 has made big steps in including those things in the modeling mode, it still has a long way to go. You will have a hard time in trying to work all of that out and to get it to look correct.
Let me know if you need advice on which programs to use for each step, and I can give you my recommendations.