These are some of my favorite fowl to hatch and raise! I absolutely love these small little birds. We've had a lot of success hatching Coturnix Quail eggs.
Choose clean eggs (but do not wash them!). Try to handle the eggs as little as possible so that the oils on your skin don't clog the pores on the eggs shells. Wash your hands before and after you touch the eggs to avoid spreading germs and to keep the eggs as clear from oil as possible.
Make sure your incubator is clean from the last time you used it (if you have used it). Heat to 100 degrees about 24 hours before you plan to use it. Set humidity at as close to 70% as possible and keep it there by following the instructions with your incubator. You can get a humidity gauge from a local pet store to go into reptile cages.