start by jamming along to tunes you like, forget theory just now, just enjoy it. play along to anything but just play and get together with mates who think the same and have fun first, theory and all that shite is for later. learn the notes on your fretboard first and you'll be there. and play like you mean it, if your trying out for a band play with attitude, it gets you a long way! always play like its your best and last gig, even if its to 5 people make an effort. they will remember. but above everything...if a band stops being fun then kick it in to touch or make changes.