As Resunderl said, find a local shop and go try out some of their juices for free and get a feel for the type of flavors you like. Do you like the candies? The coffees? The tobaccos? The deserts? Fruits? Etc...You may THINK you don't like something, then vape it and love it. For example, I hate strawberries but someone sent me a sample of strawberry ejuice with an order and I LOVED it! Try a bunch, then order small amounts 5-10ml of 10 flavors or so for about $20-$40 or so until you find the one you like. It is all different for everyone and I am still searching myself to find those perfect flavors!
Good luck on your search and remember to have fun with it!
~Metimbo