Hi Vanessa,
Here is one of the best links ever to how to do a breast exam and what to look for:
http://worldwidebreastcancer.com/investigation/breast-cancer-screening/breast-self-exam/
I also wanted to say that while breast pain is not usually a sign of breast cancer (it can be in rare cases) it is always wise to talk to your doctor about any changes in your breasts.
Take good care-
Laurie