I use cream instead of milk as I believe it makes the eggs more "fluffier". You need to whisk the eggs reallys fast until they have tonnes of bubbles right before you put them into the pan. Try to gently fold the mixture in the pan - too much handling means they won't be thick and fluffy.

I add salt, pepper and cheese to mine! Some bacon bits are also yummy!

Oh and I always add an extra yolk to my eggs!