The backyard games in Cherry Valley is the best place to get started I've come across since it's very casual. Other games I've been to are fenced off and they pretty much want to keep you on the audience side, especially if there are pros there. You already know a couple of people that will be at the Cherry Valley games (me, Juli, not sure if you know Bigg Matt, but he's the guy in SS picking up a stone in the
Rounded Back section). It's almost in your neighborhood too.
You don't need a kilt if you don't have one, but should you decide to get one, Sport Kilt makes some that are affordable and made for this type of thing.
Stylish, Comfy Modern Kilts for Sporting & Relaxation