To test your meter, hook up a 1K resistor and 9V battery, with the meter in series with the circuit, and set meter to read mA. You should measure about 9mA. Or .009A. Your red probe goes to the + terminal of the battery, and black goes into the circuit, to get a positive reading.
This will help you get used to it before you dive in. You need to be confident about the meter's use before you rely on its readings )
Also, when measuring current, make sure the meter is in SERIES between the source and load and not in parallel with the source. Magic smoke is easy to let out.