If it's simple blending, one flavor, just start with a low % (say 2), shake it, test, and keep adding flavor a couple % at a time until you get something you like.
Some flavorings really only need a couple % total to be good. Others need up to 20% total (these are mainly all organic, "weaker", flavors).
You could go into the DIY e-liquid area, then use the Goggle search window at the upper right of the forum page, type in Healthcabin and see what threads come up.