I've just looked up the recipe I use.. I gues you'll have answers by the time I've wrote this.
4oz Self Raising Flour,
4oz marg
4oz sugar
2 eggs.
1tsp vanilla essence
Whisk marg and sugar together until really fluffy, it goes from yellow to a lighter yellwy white.
Whisk the eggs, again, really whisk them as much as possible.
Add flour in to marg and sugar mixture, bit at a time, with the whisked egg also a bit at a time.
Mixture should be a nice "dropping consistency" I.e put it on the spoon and give it a flick of the wrist, it should go with a noice plop back into the bowl. I usually double the mixture, to make two cake tins full, and also knock out an ounce of flour for an ounce of cocoa powder to make a choc cake... (well, no one in the house has complained yet!)