I've been at this professionally for a little over 2 years. When I first started, I didn't know of any face painters near me, so I searched around online to get a feel for what others were charging and went from there. Maybe you can search around in your local area and see what others are charging. Take this info, combined with your own experience and/or skill level to decide what you'd like to charge.
For most events where I am hired by the hour, I have them provide the setup... table, chairs and overhead shading if it's outdoor. I only need to bring along my rolling suitcase full of my supplies and a sign if I'm using one at the event. If it's a festival where I've paid to be there, then I bring everything... the canopy, table, chairs, supplies, etc.
One good way to get jobs is to have a website dedicated to your business. You can post on Craigslist and Partypop for free. Sign yourself up for some local events, where people can see what you're doing and always, always have your cards out for people to freely take.
I always put them on the table when I'm hired to do events as well.
Hope this helps.
