Lots of stretching, set up a playlist that has of sexy/silly/highly requested songs, eat something light with lots of protein beforehand, research popular topics to discuss with clients, and the very last 5 minutes I browse other Model's rooms to see what kinda of vibe/ competition I might have.
But, the most important thing I do to get cam ready is just remind myself that I love my job and I love how sexual and sensual I can be!