There are numerous mini-tools available. Personally, I got one from Home Depot that is a folding allen set (Metric). A lot of people like the one from Topeak, the Alien.
Get at least a 4,5,6mm a flat blade, a phillips, and a chain tool. A patch kit, mini-pump and a spare tube. Of course you'll need a seat mini-bag to put this stuff in.
Get some bicycle specific lube as well. Hose down your bike (not spraying into bearings), and let dry. Lube the chain the next day!
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger