Here are the rules about volunteering;
You MUST have atleast 3-4 months of practice.
You MUST work for free.
You MUST be willing to have your work looked at and expained.
You must be the age 14 or older.
Do NOT volunteer if;
You can’t draw,
You want to be paid
You are younger then 14 and lastly
You must have experience with the section you are working on.