I've been a peri teacher in schools and privately for 20 years - along with playing / recording / writing.
First things first - Get an up to date DBS check done and register for the update service. This will settle minds and set your stall as a professional thinking tutor.
The first thing I do is make sure someone learns to play something in a lesson. If theory is the opening gambit, you won't keep them for long as a student (unless that's what they're looking to learn), and they'll end up elsewhere.
Theory is great, but should absolutely not be the opening salvo.
Make it fun
Listen carefully to what someone is looking to learn in their time with you. Be it a new style, or deepening knowledge of an existing one.
Always be honest with a prospective student - If you have nothing to offer them say so. Let your first students know that you're just starting out - perhaps offer a discounted rate in that initial spell?
I'm happy to help out over PM if you'd like to reach out for more info mate