Flagbag, Capn Bucky's excellent real world experiences in his Daysailer, compared with your newbie status and lack of experience, point to you staying in if the winds start to get close to 15 knots.
This past Sunday we had a windy day, winds in the 15 knot range with gusts. A guy took his 2 small kids (Wearing PFDs, good for you dad!) out in a Sunfish. They capsized, and he didn't know how to right the boat. A small powerboat was nearby, to get the kids out of the (warm) water, but a prudent measure nonetheless. I sailed around (couldn't go too slow without striking my sails…) and coached him to right the boat, douse his sail, and get it ready to be towed in. This was certainly an example of someone who should not have gone out in that boat, in those conditions. Just because "Hey, it's real windy, let's go sailing!" doesn't mean you should. On the flip side, I was wishing I was out in a Sunfish, because I would have been scooting along on plane having a ball.
You need to learn your boat in nice, manageable winds, in pleasant conditions, and slowly push the envelope. When you are totally comfortable sailing all points of sail, tacking to go upwind, gybing without fear, putting the boat wherever you want it to go under any wind direction, then you can start working up to stronger winds. A little fear and adrenaline is good for ya, but not too much! Also, by this time you should be learning about sail controls like outhaul, vang, Cunningham, and jib fairlead position, and why to adjust them the way you do (if your sails are new enough to change the sail shape, as opposed to old, soft, blown out sails.) Also, as Capn Bucky states, he knows how to tuck in reefs, drop the jib, etc, to change the amount of canvas for various conditions. Keep the dry side up!
You'll learn, and do fine. It's like walking. Couldn't do that before you crawled around a lot, could you?

Get an experienced sailor to go out with you some, or join a club, and learn the ropes.
Keep having fun, it's worth it!
