Avoid involving your children with everyone you date.
One of the most difficult things for a child after his parents separate is being exposed too soon to a parent's "new" partner.
Protect your kids from uncomfortable feelings by not involving them with your dates.
Recognize that, even if you really like someone you've gone out with 2 or 3 times, you don't know for sure at that point that the relationship will "work out" and become long-term. If you involve your child and it doesn't work out, your child is again placed in the vulnerable position of feeling rejected, left behind and hurt.