Welcome to the site.
I found that if I were just starting to wear thing I would start with an iKingsky thong. It is easily the most com thong I have put on my body. There are many great thongs for many different manufacturers. I agree some of it is trial and error to find the best fitting thong for your body. While many like Papi thongs, I find that they do not fit me well. As a result I would encourage you to try different manufacturers, styles, materials and designs.