Good afternoon;
Wy waife and I are raising pigs for the first time this year, and I understand what you are up against.
We purchased three pig from a local pig man who advertizes in the local free-trader/thrifty nickel paper. We were able to see where the pigs were raised, and how healthy all of his animal looked, so there were no problems there. You should double check and make sure that if the pigs you are are males that thay have been castrated, or know someone who knows how to do it for you and teach you... See my other thread.
We have plenty of space, so our pig pen is about 50X50, and we only had three hogs. They don't need near this space, but they seem to enjoy having it, and get more exercise. We don't worry about the extra food consumption that comes along with the exercise, as we get most all of they their food from a local restaurant as food waste.
The other down side of a larger pen is more fence to maintain... We have a single strand of smooth electric wire that protects the bottom of the fenceline. This has worked very well, and only failed us during a lion attack.
The pig's shelter that we use is an old pickup topper mounted on railroad ties. Works very well, as we don't need to get in there very often, but can when we need to. It also helps that the topper is on an angle, so that condensation from their breathing doesn't drip on them as they sleep.
We got three pigs to allow for the case of one dying, and two of anything is better, happier than one. We are glad we did, we are now down to two, but next year I think we will raise five- The costs and overhead in terms of chores etc, would be the same, and we just like the dang critters.
If you can, have utilities run to the pen. Water and electricity at the pen, at a touch of faucet and switch would be REAL nice, but I've been accused of having overly esotric solutions to simple problems.
Good Luck, and welcome.
Unixguy.