Welcome to X Marks the Scot!

I really can't answer your questions, but I was in a similar boat at one time. My only advice is to do your research, and asking questions is part of that research. When you get an answer, though, don't take it at face value; ask for sources. Question the sources; centuries of history, tradition, and lore often get muddled together when it's important to keep the three separate.

The clan system was based almost as much on territory as it was on family, so knowing exactly where your ancestors lived (and which clan[s] dominated that area) will help you determine which tartan is best suited.

Good luck!