June, Don't be afraid to experiment ,
Rarely will you mess up a chicken no matter what you do. Keep in mind if you think it will taste good injected it probably will.
I have and many on this forum have injected beer, wine , apple juice, butter , Cajun seasoning, broth , both vegetable and meat broths.
With that said brineing is a excellent practice for poultry no matter how its cooked.
Don't be afraid of the size of the chicken either. 2lbs, 5 lbs or 12 lbs... Cook by temp and it will work. Even Cornish game hens are fine.
Its going to be dark in color (the skin) when its done most likely. More so if you put oil on the skin. Use your thermometer more than anything else. And remember the temp will continue to rise when you remove it so pull it a couple degrees lower than the target temp.