E-liquids are a highly personal thing. What one person thinks tastes great, it'll be like sucking on a dirty sock to someone else. Only you will be able to tell what flavors you like by trial and error. I highly recommend going to EC Blends. They sell juices in 5 ml bottles at around $2.50 so you can try all kinds of different flavors without breaking the bank. The more you customize and add on to the order the price will change but only a little.
Try starting out at the nic level of your choice, 50 PG/50 VG and don't add anything to start. Every order is made only after you make the order so some steeping time may be needed. Steeping means to let it sit and age. Usually a week is good but some juices require more time. Take the cap off, put the juice in a safe place away from kids and pets, somewhere dark-ish is the preferred. Shake daily and let sit. Most flavors will become more full and robust with steeping. Some few are good right out of the mailbox but I've found those to be rare.
Good luck!