KG2, can I ask what pattern you are using? I've made bags, with and without zippers but most had pretty good directions to follow. It looks like the bag Patchworkbarb posted has "D" rings, which can make adding a single strap a little easier because you add the long part of the strap after the rest has been sewn. Not sure what all video's you've watched, but I do recommend The Crafty Gemini. Her video's are pretty clear and she gives a lot of details that may help.
https://www.youtube.com/watch?v=L9ekg6QghSc