How cute, congratulations! My daughter's sixth tooth is coming out now, she's 13 months old. I purchased a little kit from Orajel. It has a toothpaste and a little brush. The toothpaste is more like a gel, and I place a microscopic drop on the brush. And the brush is more like a finger puppet, you place in over your finger and brush. It's not only good to brush her tooth, but you can brush her gums as well.
It teaches her the importance of brushing and it also massages her gums. She'll enjoy it. Now my daughter takes it away from me and "brushes" her own teeth.
You can purchase this in a Supermarket, or a Pharmacy ( I think I purchased mine in CVS).
Good luck!
K