Workshop

Since I couldn't "playtest" it, I decided to create my own setting. The roles have already been devised, and the lore is generally described. The problem is that I lack experience in balancing the setting. Who would you recommend I consult? Or, who can I turn to (but only if they can offer helpful advice)? Are there any methods for testing the playability of a setting, besides simply trying out all possible variations (I've tried, but it's very difficult; if I don't receive any more rational advice, I'll have to resort to this method)?