I do a lot of fencing during the spring and summer. Last year was miserable - I went right through several patches of poison ivy & ended up with rashes all over me. This year, I'll be sure I have the rubbing alcohol to wash the oils off in advance of putting in more fencing. Planning on fencing in at least 5 more acres.
For gear, a 3 point hitch post hole digger for the tractor works really well for setting the corner posts. Plus, a wire wrapper for tying fencing sections together, a post pounder, a come-along for tensioning the fence (plus pull it taught with the tractor), and a tool for attaching the fencing to the posts. Oddly, I don't like those fencing pliers much & prefer separate pliers for each part of the job, though the fencing pliers are best for removing the big heavy duty staples from wooden fence posts. I also prefer to use a ratching tensioner when putting cables between the 3 posts in each corner.
For style: I prefer the woven wire. Welded wire is crap - I tried it a couple of times and ever last inch of it has made it to the scrap yard within 5 years. It doesn't last. The woven wire (field fencing) will last the rest of my life. I prefer Red Brand, and generally use the goat and sheep woven wire (much smaller holes than regular field fencing) at a 4 foot height for property lines, and 3 foot height for dividing pastures. (My goats can't get over the 3 foot stuff.) The stuff is a little pricey though; around $300 for a 330 foot roll. Toss in some metal t-posts and you're looking at a couple grand for a small project. Plus, I toss a strand of electric above the fence; I think mine is a 50-mile charger, with enough of a bite to knock a person onto their butt. Otherwise, the goats climb the fence to reach yummy apples hanging over the fence line. Barbed wire is getting to the point where it's considered archaic. The injuries it does to animals cost a lot more than the money saved with the barbed wire.
For websites, you might want to try tractor supply.