Which is the main purpose of a vision statement?

I'm a principal of a primary nepali school.(class 1 to 5) there are only 3 teachers altogether.it is very difficult to teach them effectively.so one private institute asked me to write an application for 2 teachers with school minutes.i have no idea about it: 1. how to write school minutes and 2. how to write an application for the post of 2 teachers. me kindly.