I've killed or seen hogs killed with .222, .223, .243, .270, 30-06, 38spl, 9mm, .40s&w, 45acp, and a .44mag. All of these were effective if used within their limitations and placed well. The biggest two hogs I've killed fell to the .223. They were pretty close and I was shooting Sierra GameKings in it, so they got good penetration and expansion. I like the AR the best. Unlike deer, follow-up shots are often needed on the hogs. I've seen hogs run 50+yds with no heart whatsoever after a good shot with a 30-06. Generally, CNS shots are your best bet. Also unlike deer, the front shoulder immobilizing shot doesn't work too well. The bones you need to break are too low and hitting the shoulder high will usually miss the heart. Neck or head is the way to go if they'll stand still long enough. If they're running, I'll shoot center mass to try to immobilize them.
An ideal hog gun (and what I'm planning on building next) would be a 16-18" 6.8SPC AR with an optic suitable to whatever terrain you're hunting. Good balance of weight, versatility, power, and speed.
As for where to go, there are some guys on here in your area, they should be able to point you to a place. And I agree with thejanitor, learn hog anatomy. You can check out texasboars.com to learn more.