For years I rode without a helmet. When I got my Juiced CCS I decided it was time to get one. I literally bought the cheapest one I could find on Amazon. It saved my life a couple of weeks ago. In retrospect I wish I would have put my safety above saving a few dollars. Whatever you get, be sure to wear it.
On the mirror, I ended up getting a new set of grips so I could use an end bar mirror. I didn't want to cut the ends off of the stock grips. I tried a couple of alternative mirror setups but the end bar mirror worked best for me. If you have been riding around without one, when you get one you'll wonder how you survived without it.
The other thing you'll need is storage. I originally bought a little soft bag to go on the rear rack and almost immediately realized it was too small. I ended up putting a cheap hard shell motorcycle trunk on it and it works well for me.
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