Hi Tim,

aside from some basics in Fundamentals, the rest of the site is something that takes some searching, but the teaching is here.

I think your simplest approach is to reach out to Christopher. He may see your post here, but its probably best to put your post in his forum. I am guessing one question he would have is, what do you currently know. To do what you want, you will need to understand what chords and scales go together. He likely has links to all this stuff.

Quick answer to what lead players do when not playing lead: they join in on rhythm