imho, I don't think you'll make it on your own, even with the best advice on here. There is more to it than playing a bunch of advanced pieces, you know?
I have played guitar for about 4 years now, and i am starting my grades soon, i am grade 8 in practical but my theory is awful.
Get started with classical music as soon as possible! Check out some easy Bach (Notebook for Anna Magdalena), classical sonatinas (Clementi, Kuhlau or Mozart), Romantic (easier Chopin preludes or waltzes) and Modern (Bartok's mikrokosmos, maybe) pieces.