My advice would be to move in and have a couple of weaners first, test the situation and see what investments are needed. If your looking to put a few pigs on the ground then you need to consider the amount of pigs.
Pigs will decimate ground and you'll have to consider the run off, soil type and access to water. Look up free range units - Say Helen Browning. From all the good outdoor units the land is dry and flat.
We had ours in the corner of the mountain on a large area with oil tank cut in half. Water and a huge pond. We hardly saw them it was easy but these were just fatteners. The fence was a standard farm wire and it kept them in also no need for rotation.
Things to consider - security, escape artists, muck, run off, water supply, collection and loading points. How many and selling the offspring which can be hard and not that lucrative. Feed costs are high, vets fees, farm trailer.
Never done rotation with pigs as the land area weve given them has been huge with mature trees, farm fencing, good water.
Doing it properly will involve investment but better to do it right from the start.