How do I hang up an beneath the cabnet microwave oven? Someone gave me an under the cabnet used microwave oven, but did...

Someone gave me an under the cabnet used microwave oven, but did not pass me the 3 sets of nuts & bolts to hang it. They did give me the "U" shaped bracket that go around the back. How do I know that kind of bolts to use, and where on earth do I get them? Is the brachet supose to be bolted to the sheetrock wall?
Any eyeshade printing tips?
Answers:    bring your machine into home depot and explain the situation. they are immensely helpful...
Decorating a candle?
The bracket needs to be secured to the studs inside the wall.
Drywall won't hold the solidity.