raymondxcho,

Carlton nailed this one for you. Just drop by your local bike store (LBS). Let them take off the old/put on the new bolts. As noted, ask for steel - not aluminum. If the LBS pushes aluminum bolts be polite but decline. You want steel. You also want a chainring bolt tool. That's what it is called - a chainring bolt tool. It will cost a few bucks. You will then be able to check/tighten chainring bolts whenever the mood/need strikes. Start at your LBS. They are patiently waiting to greet you.