text: Romance and erotic novels sell a lot. Then horror, adventure, suspense, mystery, detective, action and adventure rolled into one can be a good combination. Fiction related to history and psycholog also catch and attention. I think people are mad about diet and fitness these days and new parents read a lot about books on parenting. Children fairytale books with pictures are desirable and so are books that give good practical and handy ideas on how to make life better such as Housekeeping, Lifestyle, Beauty, Fashion, How to be Successful etc. I think for startes, such topics will be your safest bets.