Beginner question about measuring current using digital multimeter
General rule for measuring currents with multimeters:


Start with the highest range available (in you case: 2000 mA).
If you read a value below the next lower range (in your case: 200 mA), change to this lower range.
If the value is below the next available lower range, again, go one step down.
...


Here's a very good article by Analog Devices' applications engineer James M. Bryant about using standard multimeters written for beginners with much attention to details.