I've found that if you put the base of your finger (where it connects with the hand) on the bottom of the neck, and use the whole finger to barre (so a good portion is laying off the top) it's pretty... good. At least for me, anywho.
There's tabs for a lot of Joaquín Rodrigo's compositions, and they are bloody good. The faster parts are hard, but if you practice it a lot, it should come to you eventually. He wrote the Concerto de Aranjuez and Fantasia para un Gentilhombre.
For making your own classical compositions, the best thing to have is a very well developed ear. Transcribing compositions, learning them from ear, is a good way to develop said ear. Or so I've heard.
Good luck!
"And all you touch, and all you see, is all your life will ever be," - Pink Floyd
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