well i mean college on day realease is always good, alternatly work. along side the internet and/or books are always good. Well actully i really recomend a good book or 2 (i have some in mind, but will have to get back to you on titles). There's been a few programs of interest on tv, hopefully you saw old jimmy's programs.
Poultry is fairly easy, shouldn't have any worrys really, read a book, reseach prices/trade, and your set.
pigs.... work on a pig farm, best thing really, either one/couple days a week, or for a fortnight? again books, and prices/trade.
as for veg, no personal experience, but at a guess, either go really big for large machines and employ... or go fairly small, do things by hand a bit, get good storage, promote that it's fresh local produce and sell to pubs and resturants and people in the area.
thats just an idea and my view, take it with a pinch of salt.