This will at least ensure that the module has been tested in the environment of its intended use. Most modules have a great track record of longevity and maintaining its labeled output for long periods of time, and there shouldn't be any problems, but it can't hurt to choose a solar module with a good warranty. If you will require seasonal adjustment of solar module angles in your area, make sure you choose a mount that can be adjusted. These generally track from East to West. Seasonal North-South adjustment may still be desired.
Modules are less efficient at higher temperatures.
Read the owners manual or instructions thoroughly for each piece of equipment. If you are going to expand the system later, you may want to purchase a charge controller that can handle your future system component size. Make sure the conductors can handle the calculated ampacity for each connection. Make sure all connections are secured to the correct terminals and that the polarities are correct. Keep wire lengths as short as possible.