The scale you use depends on what key the song is in and what chord you're playing over.
As for "classic rock" licks, you can go get some of the original blues records by pioneers like Robert Johnson, T-bone Walker, Muddy Waters, B B King, Albert King, Buddy Guy and others and learn all you need from them.
That's how Eric Clapton, Jeff Beck, Jimmy Page, Keith Richards, Duane Allman, Gary Rossington, Jimi Hendrix and everyone else learned to play what they played.
Maybe you'll get a new inspiration from that music by using the Lord as your guide.