To glaze it you can do several things....

1st they make a polymer clay glaze that you can buy at the craft store

2nd you can use floor wax (Future)

3rd you can spray it with clear acrylic spray

4th you can use clear nail polish

The only problem is if you use permanent marker on them for any reason (signing on the bottom, whatever) you need to do this AFTER glazing.
Learn from my mistakes! I did some Christmas ornaments and used black sharpie for fine detailing then glazed the piece and it RAN!!!

So....always glaze before adding any marker details!

Also, you can't put items back in the oven after glazing as it will melt the glaze.

For those of you that may not already know, you can mix your own colors of polymer clay. There are several websites that give you amounts etc.
but, all you really have to do is play with it.
ie. yellow with small amount of dark green kneaded together makes a lime green.

Hope this helps!