As is so often true in poker, how you play a hand depends on the normal factors: table image, position, tourney vs. cash game, opponents, etc. I disagree with those above who said always fold or open raise an early small pair. There are frequently situations you will benefit from a call.
The standard move, certainly at lower limits, is the set mine. The set mine is played by seeing the flop cheaply against a couple opponents and usually trapping another player who has one or two pair. When you have a pocket pair, you will flop a set about 10% of the time. So if you set mine, you need to average at least 10x your initial investment in the hand to profit. Not all sets will pay off, so be wary of possible straights, flushes, and other better hands. That said, you should not be frequently timid when you do hit.
In later positions, if I am first to open with a small pocket pair, I will probably raise more than call. The later the position, the less action you will be able to get if you flop a set, so you need to play a bit more aggressively and try to pick up the hand preflop or on the flop. Don't get too involved, and if you face resistance, just let the hand go and move on.
There are certainly more advanced plays you can make, but these are the basics to playing small pocket pairs.