First, congrats on opening your own Etsy shop! I know it takes a lot of time and effort to get things listed and made!
My field is in Integrated Marketing and Communication, and I thought I would be able to help out a little bit!
I would say your target audience is defiantly children, and women with children (obviously! lol) and maybe even seasonal. I would suggest looking into your local renaissance festivals, any comic-cons and just posting on as many community discussion boards you can. Also check out your local paper for their on-line and print additions. On-line advertisement is a lot cheaper than print (for obvious reasons) but I would suggest just digging really hard for as many outlets on-line as yah can.
I would also print out small fliers (just computer paper but nothing too fancy) and posting them up locally around town. Daycares and second hand thrift stores, and any children-orientied outlets. Family owned businesses are a lot more lenient on posting things, and often more willing to help out because they make their own decisions. (Heck, even Starbucks has a "Community Happenings" board).
Hopefully this gets you started in the right direction. I saw someone also mention the SBA for the U.S. and I would HIGHLY suggest just reading through their site. ( I printed out the whole thing and put it in a binder lol)