I think ence building is very localized. What works here is not always advisable there.
Previous reply made a good point about what you will put on the posts. Will you use 4-5 strand barb wire, net wire, boards, etc?
If you go to
Stay Tuff Fence Mfg Inc. - High Tensile Woven Wire Fence and Fence Installation Tools they have a really good brochure on fence building you might find useful. Check with some fencing supplies dealers in your area and see what most people, especially professional installers are buying and using.
Personally I really like the staytuff product. Thre is also a 'staytite' brand that claims to be good for at least 50 years if properly installed.
If you don't have access to a good posthole digger (either a strong kid or a mechanical one) consider renting or hiring.
Good luck and post us some pics before, during and after.