redbrand.com has a lot of information on fence products,I have built a lot of 5 and 6 strand barbed wire fence. You can go all wood posts or you can set a wood post and then several t-posts,you need to get your corners set good so when you stretch your wire you will not move your corner posts. I generally set my posts about 18" to 22" deep,I always used locust posts,you could probably buy some pressure treated posts. You can dig the holes buy hand or if you know of someone with a post hole driller it would be a lot easier.Once the holes are dug and the posts are set you will need to tamp the dirt in around the posts,some old timers even go buy the phase of the moon when setting posts,though I never did.You will need a set of wire stretchers and some fencing tools and fence nails. How long of a fence are you wanting to build?What are you fencing in?