@LostAngel, as this is your first time ever creating anything, I highly advise you to watch and read some tutorials for FEBuilder. Before you can run, you must first walk.
To answer your last question, you will need to insert the FE6 Forblaze spell into the FE8 Rom. However, there’s more stuff involved than just that. It’s not a simple process, as spell insertion is, I would say, a mid-tier skill you’ll want to understand the lower-tier skills first; the absolute basics.
I recommend looking up several tutorials for FEBuilder and for GBA Game creation in general.
https://feuniverse.us/search?q=tutorial%20febuilder
(Markyjoe’s FEBuilder Tutorials are particularly beginner friendly!)
Also, Meme Tzar made some videos. His microphone quality isn’t amazing, but he teaches the fundamentals.
