Painting a desk - what type paint?
Ah...an excellent choice
You are pretty much wide open for your paint choices, most anything can go over that stuff
But I'd suggest an enamel if possible
-More durable than just plain paint
A waterborne enamel such as Satin Impervo (Ben Moore) or Pro Classic (Sherwin Williams) would be a great choice
They also come in oil-based form, which have a slight edge in durability, but are slightly harder to use, have higher VOCs, and require solvents to clean up
Either/or would be good depending on what you feel comfortable with