Check out online wordings for ideas and then just be creative! As for the registry information you can include a cute little business card, make one if the store did not give the mom any, include the website, store name and mom's name.
As for the no kids rule it's a touchy one. Some people get super offended and others love it. I personally adore the no kids rule sometimes because it means I get to go out and be L. w/o kid! It's fun adult time. Others view it as a personal slight against them and their child. So be ready for some negative comments from people. Sorry.
Anyways you can include that information on the bottom of the invite such as "Sorry no husbands, friends, boyfriends, or children allowed"