If you have a child: I have none of my own, but I have helped to raise two. Your child is a welcome part of the parcel, and we will get along just fine!
If you discuss your ex(es) extensively on the fist date, that will be our last date. Stop throwing them under the bus.
Above all, be FUN to be around. Life is too short for the blues (unless you listen to it or play it!).