How do you rosin your bow?

ada

As a general rule, cellists play with dark rosin.  use as little as possible, and certainly do not rosin every time.
I start by using just a few quick strokes at the tip to warm it up (with friction, I mean...), then use maybe 3-4 light passes, full length.
Don't make the mistake of warming up the rosin at the frog, you'll end up with too much at a place you're not going to need it.
I can tell you the real secret is practise, but you already knew that!