Hello,
I'm sorry for the troubles you are having with this product. Unfortunately, we are not the manufacturers of the product so if any items are missing from inside the package/kit itself, you will have to contact the manufacturer and they will send you a replacement item for their product. Since we do not put these kits together, we do not have any supplies that go along with the kit or design. Here is a link the Thea Gouverneur contact us section of their website:
http://www.theagouverneur.com/contact-0018000000112.aspx
They are located in the Netherlands so an email would probably best way to contact them. I would just let them know that you are missing the instructions for one of their kits and they should be able to just send you a copy/replacement for it. As far as the strand usage, most people use 2 strands when stitching on 36ct. Linen so I would go with the norm unless it's stated differently on the instructions or package somewhere?!
~Kristi @ ECS