You could try these instructions (just don't include the second set of loops). Free Tails Down Hair Bow Instructions: hairbow free directions, hair bow business work at home
When I layer my ribbons I don't usually use any type of heat bond. I just make the bow and hold the ribbons very tight together. If the top ribbon seems to be pulling to one side or not lying flat I'll soemtimes use a tiny bit of E6000 glue to tack it down (I don't use hot glue because it's bulky). However, the heat bond idea would probably work great!!
Good Luck! HTH!