Whenever you're ready! The lessons are available online any time, and your access to the class never expires.
As long as you need! Your access never expires, so you can come back again and again.
Ask your questions on the platform and you'll receive instructor feedback. Your fellow students are also likely to jump in and offer advice from their experiences.
Catherine will show you many great techniques for using studio lights and flash. However, you will be expected to know the basics of how to set up lights and how to work an off-camera flash. If you need a refresher on basic techniques, check out Kirk Tuck's Studio Portrait Lighting.