Literally tying the knot.... help!!!!

Okay so we are going to do a tying knot ceremony within our wedding, We bot went to school for fisheries, work at the same fish hatchery, and literally fish together every chance we get. So this is a way to incorporate the nautical aspect of our relationship in our ceremony. With that said does anyone have any pointers? I am trying to find the best rope to use, and the lengths of each rope? Also I read somewhere that you can have a knot bearer who after the rope is tied you give it to and put it in a box of some sort ? It sounds like the perfect job for his sister so she can be in the ceremony but I am not sure what kind of box to use. I would look up videos but because I live at a remote fish hatchery in AK with very limited internet I can't stream any videos. Any help you can provide will be greatly appreciated!!!