A museum near your homw is looking for people to do part-time voluntary/unpaid work. You would like to do some voluntary/unpaid work at the museum.
write a letter to the museum director to apply for the voluntary/unpaid work.
In your letter
explain why you want to do voluntary/unpaid work at the musesum.
describe some skills and qualities you have that would be useful.
give details of when you would be available for work