You may want to include information on where the production was performed, what school or theatre company put the production on, and what part you played. Every actor who's actively looking for acting work must have a resume photo. When you're first starting out, you don't have to spend hundreds of dollars. Any photo lab can do multiple copies of your photo, but they can be expensive. If you find that you're going to a lot of auditions, you'll need to do some further research to find a company who can do prints cheap.
Most major cities have theatre companies who put on theatre productions with volunteer actors.
This is the best way for someone who's just starting out to build credits for their resume, network with others, get some exposure to industry professionals, learn the craft, and have fun. Some companies advertise their auditions in a local paper, but you can also phone to enquire if a company does amateur productions and when they do auditions. If they are auditioning, make sure to ask what they require you to prepare for your audition. There are no hard and fast rules about when to start auditioning for professional theatre companies. If you have a good photo, a resume with at least a few credits, you've had some positive feedback about your performances and class work, and you feel confidant, go for it.