well, it's not something easy to start, especially someone not used to the ocean but i'm sure if you did it a lot you could get decent in a season. it all depends on the person. id take a lesson first just to get the basics down. I ended up getting into it because one summer years ago I was watching the surfers at the beach and I was like mommy I want to do that! it was the end of the summer though. the next summer quiksilver was holding a day surf camp for free for kids who wanted to learn. so I went to a local shop, asked for advice and rented some behemoth of a board and went to it. I got one wave and I was hooked. sometime later I went to another camp which was daily for a week and used their boards and learned. then I bought my own board. at this point I was able to ride them straight in, not really cut yet or anything. I went with a 6'8" "funboard". it's wide and easy to paddle and stand up one which is why I went with it, it's also a good board that once you start to advance it's still useful. I still use it often depending on the waves. luckily for me I have some neighbors who gave me two of their really nice short boards, one is 6'2", and the other 6'8". I got lucky in that respect because now I don't have to go and buy one.
IN short,
start with a few lessons to get a feel of what you're doing, using rental boards. (you don't have to take a lesson when you rent a board, you can just rent it and go but it would likely help to have lessons.) after awhile you'll probably start wanting your own board. I went with the fun shape because it's wide for easy paddling and buoyancy and it's still fun when the waves get bigger, and I improve. from there, who knows.. I prefer shortboards, but some people prefer longboards. it's whatever you want.