Trying to figure out surfing?

Hey guys, so I got an internship at UC Irvine this summer at their medical school and I want to surf while I'm out there. I hear Newport Beach is in Irvine and that it is a good surf spot (as far as the "types" of waves there I have no idea). I don't know a thing about surfboards, parts, types of waves etc. but I want to learn. Also, I am going to buy a surfboard when I get out there, but I have no idea what to buy (brand of board, size etc.). As far as what I have read on the internet the consensus seems to be that beginners should buy long and fat boards. The thing is that I have skateboarded and snowboarded (I know they're probably way different from surfing) all my life. I'm really athletic, am in great shape, and pick up on things fast. Should I really get a long and fat board, or could I jump into a more intermediate board? What is an intermediate board? Also I am about 6'1" and weigh 190 pounds, what sizes should I be looking for? I mostly want to go fast on waves and carve. I don't have any real desire to do any tricks, but I would like to be able to go back inside the barrel of the wave. Any help is greatly appreciated! Thanks!