L.W.
Hi,
There's a great website called www.momsofga.com.
It's a site for all moms in the state, but Gwinnett county is very active. There are lots of events in this area and also in metro atlanta in general. The site is a forum where moms can turn to each other for advice and support. They also have local playdates, moms night out, family outings, etc. The group is very friendly and welcoming. It is free, so I'd recommend you give it a try.
I am also a SAHM with my first child and live in the 30044 area. My son is 2, but if you'd like to meet up sometime, do let me know. Thanks and goodluck!