Welcome to the forum M1! 
For the stripes, run out to your favorite hobby shop and see if they have plain decal sheets. You can get a sheet that is solid blue, yellow, white, black and just about any color that's out there. I usually keep a sheet of yellow on hand. I've used it to represent the Mediterranean Theater I.D. bands on P-51s and, when cut super duper thin, they make perfect missle striping. Naturally you can get the sheets in whatever colors you might need.
A second option, if they didn't have the colored sheets, would be to purchase some clear or white sheets and simply paint them the color you need. I like to airbrush the color on so it provides a thin layer of paint as opposed to hand brushing it on.
If you can't find these sheets at your local hobby shop, they are also available on-line. I think if you check out a web site like squadron.com and do a browse under their "decal" category, you'll find these sheets. They're not very expensive at all.
Yet one more option would be to look through any spare decals that you might not be using. Check to see if there are unused walkways, stripes, nose art or anything that you can cut thin stripes from. I like this option the best since it doesn't cost you anything. 
Best wishes and enjoy the forum! Post pictures as soon as you're done!
Eric