In the cheaper tripods, the tripod is sold with a tripod head permanently attached. In the better tripods, you buy the tripod (legs) as one item and then add a tripod head to the top of it. Some people like a ball head, and some like a pan-tilt head.
Your best bet is to go to a good camera store and they will have a dozen tripods on display. Ask the sales person some general question like "Which are better, ball heads or pan-tilt heads." The sales person will probably give you one opinion, based on which one will get him a bigger sales commission. You would probably want to try one out with your camera to see what you think.
Whatever it is that you are seeking, first know the total weight of your camera with heaviest lens on it. Most good tripods and/or heads will have a maximum recommended weight limit. You would not want to put a ten-pound camera on a tripod head rated for five pounds.
---Bob Gross---