[SammyKid11]

For help specifically on leads/soloing, you do need to know a decent amount about music theory (or have a really good ear)...but the most basic thing you need to know is scales. I need to be able to tell you what key the song is in and you be able to play individual notes in that key in several different registers on the guitar. Then you run those scales backwards and forwards over and over again, working on improving your speed and dexterity. Then you just get to a point where you can start throwing different wrinkles into those scales (instead of just going up and down) that start to sound like solos. Then you start to work on things like bends and multi-string slides...things that give your leads character and feel, rather than just being individual notes. For these later things, you'll either be good enough to grasp them on your own or you'll need someone to show you the techniques involved.

But for the earlier things you ought to be able to buy a good book for guitar scales and practice your ass off 'til the point that you're good at basic, melodic, Noel Gallagher style soloing.