Hi benvse. I would suggest you get some dacron, B-50 or B-500 to learn with. There are different grades of linen and the type you have may not be strong enough.
More info, like what weight are you pulling, can determine # of strands because of tensile strength. I'm just across the eastern Illinois line in Indiana, I can send you some dacron to try. If you do a search on flemish string building, you should come up with some pics, or vids on it.
You can do a plaited loop on one end and then a bowyers not for the lower loop.