I suppose this is kind of a silly question, but I've been trying to get into RPGs and there are a few gaming stores within walking distance that host games X times a week. I've never gone to one before and I have no idea how they work.
My favorite local store owner would cut his own throat before he would turn away a potential long term customer. Teens and pre-teens are very much allowed in organized play with or without their parents.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.