We put some of our costs up here in 2011:
http://www.accidentalsmallholder.net/livestock/pigs/pig-costs/For fencing, arks, how much you can get for a pig - the answer is always 'it depends'... On your ability, your land, the size of your intended operation, the breed of pig, whether you'll be breeding pigs, whether you're planning to sell weaners, older pigs through the ring, or butchered meat, and so on. There are so many variables that the 'real cost' will vary widely depending on the situation.
For fencing, if you're getting a contractor to supply and install fencing it'll cost far more than if you did the work yourself.
For arks - Google it, there are lots of ark suppliers, or it's not too hard to get the parts to build your own.
Sorry if this isn't much help, but there's no straightforward answer.