Hello dirty boy,
1. for the colours use the pic from Daniel
2. the Tubestripes are different on all helmets. 12, 13 or 14 ....
If it helps, look at these link. There are original screenused helmets:
http://starwarshelmets.com/original-stormtrooper-stop-that-ship-helmet.htm
http://starwarshelmets.com/original-stormtrooper-move-along-helmet.htm
3. nothing, wood or foam
Hello brother
Look at the image that I'm going to post here,those are the paints
you will only need 3 colors for the helmet, blue, gray and black
In the pouches, is possible put.. anything you can fit there, cards, your phone, candy