you can melt chocolate in a pyrex measuring cup in the microwave, but
make sure everything is dry or the chocolate will "freeze" and turn out
disgusting. If you do it in a double boiler don't get it wet either.
Save about 1/3 of the chocolate to put into the mix you've melted, and
let it melt and cool down the chocolate you already have.

once you coat, you can put it in the fridge to set much faster (in a
regular temp room, it can take a while)

I've used chocolate chips. It depends on how fancy or how homey you
want to be with what you're making.