Oh man, a good idea? take a couple hours, days or weeks to browse the recipes on ELR
There's just so much that can be recommended... seriously!
If you just started vaping, coming from so many cigarettes a day, your taste buds and smell still need time to recuperate and they'll get better with time... that means you'll need less flavoring. Also, be careful using too much flavoring and vaping the same juice all the time. You'll easily get used to it and won't be able to taste or smell it in no time. Compare it to a smoker who doesn't smell the smoke in his clothes or a farmer who can't smell the dung from his animals anymore because he's gotten so used to it. The same is true for vaping, too much of a certain flavor and you'll get that effect. People call it vapor's tongue, but it doesn't have much to do with your tongue...
One thing you'll quickly learn here is that taste is very subjective. There are recipes here that are rated by hundreds of people as the best of the best while I find them foul tasting, and some others that don't get a lot of attention are very addictive to me.
The best way is just to read up on flavor notes, buy different flavors, try them and make notes yourself. Once you start to understand and know your flavors, it's pretty easy to browse around for ideas, pick a flavor profile and mix something that you're going to like.
And by the way, I have the same issue you are having with custards. I love a good custard, but so far, all flavors I've tried are more eggy than something that remotely resembles a nice custard. I know it exists because I've tried commercial juices that were nice... so yeah, taste is very subjective and no 2 people taste the exact same thing. It's a good thing that there are so many other things out there that are really good too while I keep searching for the custard or cream that can satisfy me.
Another tip I can give is to just join the chat from time to time and pick people's brains. There's an overload of information and the vaper's community is great, always willing to share and help others. These days, most people are on discord, IRC chat has pretty much been abandoned lately.