The advice would be the same for any kind of fiction. Keep writing, and keep sending things out, not to friends and relatives, but to people who have the power to buy. A lot of additional, useful tips could be added, but this is fundamental.
Fred SaberhagenProbably all the books I've ever written have been efforts to define the boundaries of humanity.
Fred SaberhagenResearch is of considerable importance in certain fields, such as science and history.
Fred Saberhagen