Honest-to-goodness entrepreneurs divulge the secrets of peddling greeting-card ideas, printing trendy--or personal--T-shirts, turning (free Forest-Service) timber into firewood, setting up as a paper-hanger, raising earthworms (recession-proof: ""What do people do when they're not working? They go fishing. . ."") operating a custom photo lab, and 30 other likely ways of earning money at home full- or part-time. True, operating a fish hatchery is a tricky business that takes ""plenty of research"" and few home-frozen foods are apt to match the success (1975 gross: $200,000) of Captain Ken Freiberg's ""Firehouse Baked Beans""; but the detailed advice on costs, procedures, selling prices, markets, and promotion will help the neophyte minimize risks and maximize profits. Go-getters, hobbyists, retirees, and refugees from the daily grind will find this one of the more responsible and realistic guides to going it alone.