Its best not to give flouride. If babies get flouride it can cause permanent discolouration of thier adult teeth. For now you just want her to get used to you sticking your fingers in her mouth to clean them so you can just use a cloth over your fingers. When she has a few more teeth you can get a little toothbrush and use that instead of a finger (they sell little sets of 'first brushes that are rubber and in steps but they're really a bit of a gimmick you may as well use a normal child's toothbrush). Once she's old enough to spit you can start using the children's toothpaste that is low in flouride. While she has her baby teeth the most important thing that you need to do is set up the habit of oral hygiene.
HTH