I'll give you my perspective from a client's POV.
While you may think it's about you, it isn't. You're there for the client so write an ad that's about what you can do for them.
Recent good quality, clear photos. Face photos, some nudes. You don't have to be a 10. There's someone for everyone.
Give out a phone number for texting. I find it frustrating when the only way to contact is through a message board. Learn to block numbers on your phone. Don't put up with pic collectors and endless back and forth.
Truth in advertising: Be honest about your health status, age, size, etc., so there's no surprises when the client opens the door.
Save your money. Eventually you'll either grow tried of the crap that comes along with this profession, or age out. Have a plan.
Congratulations on what I hope is a fulling and lucrative career.