Have a look at Peter Biddlecombe
http://www.biddlecombe.demon.co.uk/puzzles.htm l
Also
http://www.gptucker.net/crosswords/solvinghelp .htm
The DT does an excellent book ..How to crack the Cryptic Crossword .
http://www.amazon.co.uk/Crack-Cryptic-Crosswor d-Daily-Telegraph/dp/033033655X
A Chambers and Bradfords dictionary is a must ! Also a shorter OED....and perhaps a couple of these "lists" type books...to get you started .
Just try one compiler at first and try to get into their "mindset". Or as suggested ones where they give you two sets of clues ..then you can work back and forth.
My Dad left school when he was twelve in1915 ..he was a working man ..spent his life in the Merchant Navy ..didn't have the education I had ....but he loved cryptics !
I can remember him saying things like "Well I'll be b888gered "when he managed to solve a difficult clue .
He showed me how to do them when I was still at school and I have enjoyed tussling with them ever since .
You don't have to be super intelligent .....practice makes perfect.