Razer Naga Trinity DPI for 34 inch curved ultrawide monitor

Firstly, I should mention that I know little about DPI settings and other fancy intricacies that come with owning a razer product. The main game I play is League of Legends. I keep having issues finding the sensitivity that works for me. I prefer a lower sensitivity setting but I can't seem to find a medium ground between it being too fast or too slow. What should my stage be at? Or any help would be greatly appreciated. Sincerely, Some poor scrub