Welcome to the addiction brother!
12ga is a good all a round gun but a 20ga will do well also
If your gun patterns well with this load try 4x6 shot, I find works well
I would start with a box call as they are easy to work
If you want to use a decoy a single hen has always worked well for me try not to get to fancy at first
Hardwoods next to a crop field and sit on the edge of the woods in about 10 feet I find this works the best but there are tons of ways to do it
As far as birds here in Ontario they are everywhere especially near a food source probably same where you are.
If you can see them roosting at night you are golden for the next morning!
Get in early at least a hour before sunrise about 100 yards away and hang on when you first strike that call at legal time the first response will hook ya forever!
It is the best feeling when ya hear the gobbles thundering back from the woods in the dark!!!!!!!!!!!
Keep us posted and join the contest all are welcome
Treebeard