L.B.
Hi Katie,
By now you are probably tired of reading responses to your post - they are all great advice - Kudos to everyone! But I just need to chime in. I am a single parent to a 12 year old boy. I never married his father. Just be very careful about what relationship you want for your daughter and her biological father. I tried for years to keep my son's father in his life. He would be in for a few years then we would hear nothing for, literally, four years. He lives in the same city as we do - so that was not the reason. His up and down attitude towards my son has caused emotional damage and I now have my son in therapy in hopes that he can learn that his father's inability to have a relationship with him is not his fault. If your daughter's father cannot be a steady, consistent presence in her life she would be better off without him. Her grandather, Uncle, cousin, can all be male role models for her. It is the consistency that is important not the biological link.
Other than that just love her, encourage her, be there for her, read to her, play with her and don't be afraid to tell her no when she needs to hear it.
Good Luck and God Bless - you'll do great !!