After the blinds have been paid, each player is dealt two cards face down, one at a time. The dealers begins with the player to his left and then deals clockwise around the table until each player has two cards.
Next, there is a betting round that begins with the player to the left of the big blind. This player may call the minimum bet to stay in, raise it or fold. After that player acts, the action continues clockwise around the table. If anyone makes a bet or raise, the other players at the table must at least match that bet or fold.
When it comes time for the blinds to act, their forced bets are considered a part of the cost of staying in. So if there is no raise, the big blind may simply check to stay in, since he has already paid one minimum bet.