I'll add my agrrement to chadahic and dxd about readin whatever catches your fancy - even reading bad writing can be usful, to show you what to avoid!

As for recommendations, no-one has mentioned William Golding, I think. Lord of the Flies, of course, but also The paper man; The Inheritors; and The Spire in particular.

If you would like a run down on British History (and a fair bit of American history, for that matter) which is also written in excellent and approachable English, try Winston Churchill's History of the English Speaking people - Wordwind - I would recommend this one for you, too!

If you want very good grammar and punctutation (although of a very old fashioned style) let me point you at Charles Dickens, William M. Thackeray and Anthony Trollope - his Barchester novels in particular.

And good luck!!