There are lots of resources out there (besides our own tutorials) for learning ScreenFlow. Here are just a select few:
Ripple Training's course "Creating Professional Screencasts using ScreenFlow 5" – $49
Hit the ground running as Ripple Training’s senior editor shows you how to use ScreenFlow 5 to capture, edit
and deliver professional screencasts. Use coupon code “Telestream20” and receive a 20% discount!