Turn signal can be found as metallic amber. Basically metallic orange. Both testors and tamiya have it.
Adding the bumpers before or after painting depends solely on the style of the kit. Some require them to be put on after. It doesn't make a significant difference except that you have to do a lot of extra painting if you can't assemble the entire car first.
I've used fruity loops in the past. I just doodle around but lack any real musical talent. I love the orange theme by CygnusX, and that "Light again" song.
Also, Welcome to AF!