How do you make a profit growing trees?

alright im a teen looking about starting a large field of trees, waiting 30-40 years and chop or sell whatever way i will make the most profit. so, i would like to know what tree to use (open side of a hill, plenty of sun, good drainage, good soil {not too much clay, but not perfect}) how to sell (cut myself, or hire, etc.) and any extra info. at all, even trusted people i can contact for research. i also need to know what to buy (saplings, 1-3 yrs. old, etc.) PLEASE HELP! my dad suggested that black, or wild cherry trees make the most average profit and grow fast enough to probably cut in 30-40 years, thankyou very much if you help me!