Here is a basic DMM tutorial. While I don't agree with all of the statements made regarding features to look for, this is enough to get you on the right track. Personally I buy Fluke products, but my needs are different than yours.
Go get yourself a decent meter, learn how to use it, then take the troubleshooting from the top.
Going forward from this point, please remember that it is not a crime to ask questions and admit when you don't know something. People will respect you for your honesty, and if they don't, they're schmucks themselves.
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