Nathan, you tie some great flies – and it looks like you are having fun! That’s where it all starts.
As for the thread questions, I am just trying to get a feel for what you are using. Spinning deer hair is much more rewarding if you are able to “yank and tug” without breaking the thread. Most people get frustrated when starting out because they end up using any old thread laying around. Your flies will turn out best if you use at least 210 denier flat waxed, or better yet GSP (gel spun). It is the cheapest investment you will ever make for the greatest reward.
There is a picture of GSP below.
Here is a good article on spinning deer hair by Christopher Helm from Fly Fisherman Magazine Online http://www.flyfisherman.com/ftb/chdeerhair/