I can vouch for the Yellow Cake. Though not a TFA flavoring, I consider it a fundamental flavoring, and one of only two or three non-TFA flavorings that is essential. TFA Cupcake, though, also works well in combination with other flavorings.
Haven't posted a starting flavor list in quite a while. For the new member just getting started in DIY, I recommend the following flavorings as your starting point:
Basic Flavorings
Vanilla Swirl
Vanilla Custard
Vanilla Cupcake
Cinnamon Sugar Cookie
Vanilla Bean Ice Cream
Sweet Cream
Bavarian Cream
French Vanilla Cream
Dulce de Leche
Cotton Candy
Sweetener
Brown Sugar
Graham Cracker
Pie Crust
Marshmallow
Sweet and Tart
Butter
Cinnamon Danish
Caramel
Rum
Hazelnut
Peanut Butter
Koolada
Belgian Waffle
Whipped Cream
Fruits:
Lemon
Apple
Banana Cream
Bananas Foster
Blueberry
Juicy Peach
Pineapple
Coconut Extra
Strawberry
Strawberries and Cream
Raspberry
Non-TFA Flavoring Essentials:
Flavor West Yellow Cake
Inawera Strawberry
LorAnn Cream Cheese Icing
Chocolates (Optional)
FW Peanut Butter Cup
Milk Chocolate
Double Chocolate (Dark)
Bitter Chocolate
I can make 80% of my recipes with these ingredients. The ones I cannot make are one-offs with very specific flavorings like Mango Custard, Dragonfruit, Coffee Drinks, Key Lime and Pecan Pies, Pralines and Cream, Root Beers/Floats, Bubblegums, Specialty Candy Bars like Almond Joy, Tobaccos, Oreo's, etc. If you like any of those flavorings, then, by all means, add a 4 ounce bottle and enjoy! I love, for example, peanut butter cup, oreo's, Twinkies, Donuts, Lemonade, etc.
I've probably left out a few, and maybe even your favorites, but these are the ones that immediately come to mind for me. I have over 200 flavorings, though I rarely use more than about 30 of them these days. I've tried to reflect these preferences in my recipes, and the many recipes we see on this thread in the recommendations above. The immense variety of flavorings and possibilities is what makes DIY such an interesting hobby. We can literally make almost anything. Once you learn the basics, you'll be making recipes on paper, nailing them in only a time or two of 100DT's, understanding the construction of the combination flavorings, and the genre's they represent, etc. It's a blast, easy to learn, and while not abundantly intuitive at first, anyone can pick this DIY up just by making a few of the many great recipes on this thread from the many, many great members who share their efforts and wonderful juices. In time, sometimes immediately, you'll be making great juice of your own creation, mixing to a flavoring from scratch, and able to identify four or five ingredients in every mix just by smelling it, and vaping it. It's really amazing to smell a juice and instantly name five of the ingredients, but in time, you'll be able to do this. Just takes some time in the vape lab, is all! Best of luck!
You will use these ingredients in 99% of your mixes. Of course, there are many others, but if I were starting out, knowing what I now know, these are the first ones I would buy. Single ingredient mixes will only vary rarely work, perhaps only 5 - 10% of the time. We do need the creams, vanillas and sweeteners which not only add depth, richness and texture, but also act as primary flavor enhancers. They work wonders.