I would suggest starting small. No more than 3 pigs. No breeding, just wiener to slaughter .
Expect to feed them apx 800-1000# of feed per pig. Supplement with garden waste and apples / fruit. No processed meat products if you want tasty pigs.
As Ben brought up, pigs are accidental escape artists. They don't dig out like a dog would do. They root... rite along the fence line. Easy to dig deep with a nose like a shovel!
Suddenly !!! their rooting hole is on the other side of your fence!!! Imagine that ! And look all this green grass! After one finds a way out the other two will follow.
Here is how I stopped that. Used metal roofing! Laid horizontal ,buried 1/3 to 1/2 deep. Or as much as the ground permits. As the pig roots down he may reach the end of the metal but all that is there is a dirt wall! No grass in sight! It works very very well! It is easy to install if you happen to have a digging machine around...
I've been raising pigs to slaughter for at least 15 years now.
I have a smaller area, maybe 120' x 80'.I have it broken into 5 different paddocks. ,.
Their home area has the barn ,running water and the grain feeder.
The other 4 areas are planted with various greens. After they till one I move them to the second and replant the previous one.