I'm going to shamelessly plug the folks at DIY Autotune, not because i'm a solid fan of the Megasquirt range, but because of this book -->
https://www.diyautotune.com/product/...tems-hp-books/
Recommend anyone who's not played with EFI before, read that. I'd rate it as an entry level type of book into the world of EFI.