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join WWOOF and see if you like it, its an unpaid internship where you work like a serf in the fields part time basically but it gives you a good idea of how to grow veggies and the general going ons of an organic farm. biggest advantage is that you can do it with no experience and your host will (usually) provide accommodation and meals. just be diligent because a lot of WWOOF hosts are hippies or actual slave drivers who won't bother teaching you anything, read the reviews
start off with a small parcel of land when you begin, all the successful market gardeners do it on 1 acre or a bit more max for veggie production because the work is very labor intensive. stay small but maximize the space. you could probably just rent a piece of land for a while to hone your skills. you'll also need some marketing/communication skills because selling organic wholesale to restos/groceries or directly in farmer's markets is the only way to make money. don't bother with farmgate prices and middlemen commodity traders, they will fuck you over. if you can't afford a refrigerated van for delivery just keep the produce in coolers in the back of your truck. lots of great books on the subject, I reccommend JM Fortier's The Market Gardener and Eliot Coleman's books to start. good luck, it's a very hard but rewarding profession.