That is one lofty goal if you want to eventually get 10 acres planted. Unless you planned on growing seng full time, that would be a lifetime worth of work for most folk. I wish you luck on your ambitious project.
As for security, I think that's a topic that concerns most growers on here. The only way I know to have your patch safe is to either have it right next to your house, or patrol your patch constantly. The best advice I can give you is don't let people know what you're doing. If a couple of meth heads could get to your patch that easily, then I would look for another spot. I have some of mine in places that aren't easy to get to. A person just can't park their car and walk in the woods and start digging. You either have to go through open fields on three sides of it, or on the other side you have to go through peoples houses, through a mile of woods behind their houses, over several fences, and past my shotgun before you reach mine.