Go to the Players Board and tell the board person what game you wish to play and you will either be directed to a seat if one is available, or have your name put on the waiting list. The board person will be able to answer your questions. When you are seated at the table, you may purchase chips from the Chip Runner or Floor Person. The minimum buy in is ten times the lowest bet in the game (example: in a $2/4 game you must buy at least $20 in chips).
(The dealer will answer any questions you might have, but cannot tell you how to play your hand.)