I have no measurements for this guide since it really depends on what you want from your whipped cream. I tend to like it kind of sweet!
Add the cream, a bit of sugar, and a quick pour of vanilla to the blender cup. Stir it up a bit and taste taste taste! Add more sugar or vanilla as you see fit.
One you are happy with the taste, blast it with the blender. It will quickly thicken up.
Add a dollop to a pie, in your coffee, or just lick it off the spoon :)