I am in a similar situation to you. I too past my certification last year. I actually felt comfortable enough to do some varsity games my first year. Luckily, I had some camps the summer before getting certified and someone turned back some games and I got my shot late notice for some pretty good varsity. I had my first top 10 in the state game last year and it was a two man game. I was sweating a lot during that game
What I would say is don't take anything you don't feel comfortable with, but being that you are certified, give the JV level a shot. You will find that you are probably more ready than you imagine.
About the only thing I'm not really comfortable on and I hope to get more work in this year, is addressing coaches. Last year, I did a lot of nodding, not many words came out though.
Hope that helps. Good luck with your season.