The Peas I purchased were pre-inoculated. I bought one bag and split it between two half acre plots. Ask where you get them to be sure.
For the fence I used metal fence posts for the corners and used small electric fence posts in between. To work best, use only white bags. the colored bags don't seem to keep them out. I'm guessing that the white have UV in their makeup, and they probably glow some at night. And with wind movement, they shy away from them. Poke holes ins the bottoms or they will collect rain and pull down the string. The plastic bailing twine would be perfect, Make sure you pick it all up when done, that stuff can really tangle up a tiller or disc. Keep the bags about 30" from the ground on an average. I had one set of tracks in my plot during the time it was up, about 3 weeks. It took me about an hour and a half to set mine up, 2 guys could do it a lot faster.

Russ