N.L.
Hi S.,
I was in the same boat as you, I also asked the same questions as well and found out about meetup.com; it's a great place to look for all kinds of groups in the area. I would highly suggest the New Westside Mom's Meetup Group. They do a lot of great things all throughout the week and are very friendly about younger ones.
go to www.meetup.com and do a search for the mom's group, you'll be surprised. I was :)