I have an old mentor that tought me. I've been staying with him thought the years helping out on his orchard. I'm sorry but I haven't researched any online tutorials. It's not hard though. Really not hard. You can go into all the root-stocks and such, but if your in for old-school and easy and importantly, to me at least, free, get a small fenced garden plot to make your starting place, collect apple seeds, plant them and you'll have the beginnings of an orchard next spring. Apple pressing parties are the best. Collect the remains from a few pressings and just plant them. Boom, as many apple trees as you want. The fruit will be variable but, you never know, you might discover an amazing variety. These are then your rootstocks in a year or so. Collect scions from trees you like in the late winter and whip-and-tongue graft them onto your stock in the spring either as bench-grafting or top-grafting. Orchards without needing to spend a dollar. They'll be full-size trees that will long outlive you.