It depends on what you are using for flavoring. If you are using LorAnn candy oils you only need a few drops. If you are using Wilton or McCormick type you can use one or two teaspoons. Use whatever kind of cake suits your fancy.
Oh, and welcome to CC.
Mary
I just bought Princess Cake and Cookie Emulsion. I have never used it before. I understand that it enhances the flavoring of baked goods. I'm using it in a sheet cake tomorrow. I am wanting to try something different. I'll let you know how it is. Has anyone out there used emulsions?
Welcome to CC! 
I have found that for the best flavors, using LorAnn flavored oils work the best. But you must be careful because these oils are intensely flavored. You will have to taste as you go. Some of my cakes I use very little and for others I put a bit more if I want to get a stronger flavor. Practice with these and you will find what you like best.
I like Creme Bouquet for cake flavoring and I use it in place of the vanilla, one for one. The first time I smelled it I thought it smelled just like the smell of a box white cake mix. Sort of vanilla and lemon, the way a white or yellow cake should smell. It makes my cakes taste really yummy, too.
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