If you really are not sure, start off with just a P&S, a simple digital compact camera first. Then if you think think you like to expand your photographic horizon, by all means.
The above replies telling you to not start, maybe a bit over the top. They assume you want to start with a dSLR. Remember, some professional photographers can take wonderful shots with a $300+ camera! So just go ahead and start shooting, but brush up on the theoretical side, else the pictures you take can result in disappointment.
Cheers!