Then you should decide on the shape of the board, this will determine what you'll be doing with it. There are three main variations on the board's shape the short board, the long board and the penny board. All of their names tell you right away what you're getting, meaning you really don't want the penny board if you're planning on doing any serious skating. The short board however is meant for tricks and freestyle, due to its size and shape its the board to have if you're primarily going to the skate park to try out new tricks, while a long board can go fast but it's also too heavy to perform tricks with it. And whichever you choose you can find every variation of skateboards for sale online.
And when you do choose your board don't be afraid to break it since there is a cycle to getting better with your board. You have to train to get better and break your board less but your board will probably break during the training process (which is why I'd suggest starting out with a less costly board). Also unless you're an adept the vinyl on the belly of your board doesn't matter since you'll need to keep it in one piece for it to matter, so only add art to your style when you're good enough to keep it safe.