Use the search feature at the top of the page - there is a lot of discussion and information here on that topic.
In short, "in the local woods down the street where we live" is all shades of totally wrong, unless you want to see police respond to a gun call and possibly shoot your son. Private property, away from roads and established locations like paintball fields where the activity is not visible to anyone, or, where it is understood those activities take place are safest. If your son is under 18, I highly recommend holding off until he is 18, otherwise, you need to directly supervise the activity to ensure his safety and the safety of those he is playing with, as well as to act if the police show up.
Your user id shows nothing to indicate your location, which would be helpful in advising you. The local woods in Toronto like high park is different than the local woods in Kirkland Lake.