The basics of brining. They have you mix the salt & sugar in cold water. That can take forever. The stuff dissolves better in hot water. You can use hot tap water, or even boil it. Problem with that is, you then have to wait for the water to cool. I usually dissolve the stuff in half of the water, very hot, then add ice to cool it down.
You can also flavor brine. This old post of mine has an elaborate brine for turkey.
For pieces of chicken, you can increase the amount of salt, and brine for no more than an hour.
