There are several options all of which are basically livestock fencing. If you want to fence as much as possible the most efficiently you want to use the round posts that can be driven with a woven fence. I personally like
www.redbrand.com for fencing large areas nothing is better than their Keepsafe Fence for horses(this is a very expensive product). If you splurge on the the fence fabric and the terminal posts you can go cheaper on the line posts and simplify the installation and still have a great fence.
PM me if you would like more details as I have a bit of experience with fencing and am getting ready to fence our yard for Kali. Tim