You can try all of the style courses at the same time if you want. I would encourage you to focus on one at a time. If you like rock the most, then start there. All of the concepts of notes, scales, chords & rhythm are the same on any guitar. But there can be considerable differences in physical technique when switching to electric guitar to playing rock (& some blues): picking techniques, bending, articulations like hammer-ons, pull-offs. Getting started on electric as soon as possible will definitely be beneficial.
Hope that helps!
Thanks Christopher. I have an electric but am learning on acoustic. My goal is to play the classic solo of dont cry by guns n roses so i'll take your advice even pratice on my electric. i just prefer the acoustic because i dont have to set anything up. you guys are doing a wonderful job! keep it up! :)
