Keep going! I started on Guardian crosswords 20 years ago - sometimes I only got two or three answers but would check the answers the next day. I still work some out by finding a word that fits, then working backwards to see if it fits the cryptic definition. Don't forget most clues have a straight forward definition part, then a cryptic bit.
There are books available, but I've never got round to using them - a good anagram site and crossword solvers will give you some answers then you can try to do the cryptic part! And there's always this site - maybe ask for a couple of answers which may help you with the rest.
Good luck!