New to the game

I know I’m late to the party, but I recently just started playing gw2. It’s fun as hell, but I was wondering if anyone knew the most efficient way of getting coins. I want to unlock as many character variants in the quickest way I can. Should I also be buying the 75,000 coin pack that automatically gets me a new character, or are the other packs better? Also any tips in general would be cool if anyone had any.