Cover creation

I’ve been scouring the internet for days now trying to figure out how you all make covers from scratch, I know about importing vsqxs and what not but I want to make a cover from the ground up. The only thing I’m stuck on is the midi-ing process so I was wondering if anyone had any tips about that. Anything helps really, I just don’t think I have the ear to painstakingly place each note and it sound right.