Strictly speaking, foreplay shouldn't require a manual because it's all about responding to your lover with a mixture of intuition and experience, but given how lost you and your boyfriend appear to be in this department, I'm going to recommend you go out and buy a top quality sex book. My absolute favourite for 'beginners' is Guide To Getting It On! By Paul Joannides (£14.99) It's full of fabulous tips on getting yourself and your partner into a heightened state of arousal, and the writer gets his message across in a very funny but accurate and highly informative way.
Sorry to be picky, but I must address a line in your letter. You say: 'I know foreplay should be dragged out for a long time', and this line seems to sum up an attitude to foreplay that is almost certainly part of your 'problem'. There is no 'should' in foreplay. Foreplay, when it's really working, feels like fabulous good fun. It's a sensational journey to a wonderful destination. In fact, many people would tell you that it's at least half the fun of sex. So if at the moment it's feeling like a chore, I can guarantee that in the future your sex life will get a whole lot better.