I was going to go purchase some tickets for the Panic at the Disco's honda civic tour. But I was wondering on websites when its selling tickets, and the location is FLOOR. Does it mean its front and center right in front of the stage, and its just who gets there first gets the best spot or what?

Floor usually means standing in the pit at the front, it's just a big area so if you want to get the very front you'll have to push. It's the best place to see a band so snap those tickets up!
The trick to getting right to the front is to jump around loads once the band sarts this will make people move a bit away from you and allow you to squeeze through. If someone won't move just go around them and smile a lot if people look cross and they usually let you through. Have a good time!