Hi there call duty. Good to have you here on MP. This is a great place to learn how to grow mj. There is a ton of information on how to do outdoor grows.
Since it's Maine and I'm sure your growing season is short, you will want to get some indica dominant strain to ensure that you have time to finish them up before the first frost. Someone has a chart that tells you the first and last frost dates. I'm sure that it will be posted soon.
They can be started outside. I would germinate them in a paper towel until the tap root pokes out and then plant them where you want them. Are you going to be placing them in the ground or in pots?
Good luck and keep us posted. Take care and be safe.