First off, get your name off of your old agency's license. Go to
California Department of Insurance and find the form "Endorsee Self Termination Notice" and get your name off that license. Your old agency is supposed to do it, but take matters into your own hands. Trust me, there are many ways your old agency can screw you.
Everything else is a matter of how you want to go about setting up your business. You have it covered on your post. It will be hard to get appointments at first, so set yourself up with good
GA.