B.R.
C.,
Do not introduce a man to your daughter until 6 months have passed, preferably longer. You can say you have to go out for some grownup mommy stuff, but don't say anything about dating.
You may think you have met the man of your dreams after a month, but don't make the mistake of introducing him to her yet. You never know. It is my understanding that it actually takes 2 years for someone to show their true colors, so a guy can be on his best behavior for a long time. You don't want to end up with an an abuser-substance or people. So be patient. Just stick to a 2-3 hr. date once a week or two until many, many months have passed and you are sure about him.
Intoducing the man you are going to marry isn't the problem-it's introducing several different men to your daughter.
Good luck! And bless you for being such a wonderful, caring, single mother who puts her child first. Single mother's get a bad rap, but we're not all bad! :)