I use this basic method for all my 'cakes'
I cream together 6oz stork and caster sugar (really well, use food processor or electric whisk)
I add I teaspoon of vanilla extract
3 large eggs
6oz shifted flour (doesn't have to be posh stuff I use basics)
I beat that really well. if i'm doing chocolate I take out 1 tablespoon of flour and replace it with cocoa powder
Use muffin cases in a muffin tin
Bake at 180 for about 10 minutes
T's foolproof for me, but I'm crap at decorating so can't help you there.
Good luck