I started with single flavors and mixed them in my tank. It's a good way to get a sense of what goes with what. Some of my favorite recipes have 3 flavors (excluding additives, when I use them.) I have never followed someone else's recipe but I do use some one shots for things I believe others can make better for me (think melons, I just don't have much experience with them) and some of those one shots, I really love.
I started small now I have enough nic for the rest of my life.
Anna