C.V.
That's very sweet of you.
I was a professional baker and cake decorator before I came into the military. I still enjoy making cakes on occasion. What I will say probably won't be the norm, but whatever.
Make a cake from a recipe that's based upon a boxed cake. Like this one: http://allrecipes.com/Recipe/Too-Much-Chocolate-Cake/Deta...
Why? Well, it's pretty simple. The companies that focus on cake mixes, like Duncan Heinz and Pillsbury, have perfected the art of consistency. Their products are made so as to consistently turn out great cakes, even for those who aren't professional bakers. The average home baker doesn't know which ratios of cake flour to use, don't have finely granulated sugars, and don't know the difference between Dutched and regular cocoas. But those companies do and they use those items.
Best of luck to you in your cake baking endeavor!
C.