A question regarding the level of worldly participation for a buddhist monk
The main role of the monastic community is to preserve the Buddha's teaching, but I don't think that the Buddha gave a prescription on how exactly to do that. It's been left to each community to set rules of teaching and the level of community interaction. I don't think you're going to find one magic answer. In my tradition, you're expected to have some mastery over the subject matter before giving Dharma talks. It also helps to practice the Eightfold Path enough to where you are without reproach when you enter the community with instruction. 

I don't believe it's wrong to participate and reach out to the community at any time. It just may not be helpful. Maybe like this post ;-) Then again, mastery is hard to see from the outside. 

"Before Enlightenment chop wood, carry water.  After enlightenment chop wood, carry water."