Business Proposal Writer for vending machines

The business proposal is for a local school with whom I wish to supply two vending machines.

The job requires someone with previous experience of writing business proposals and the content needed to produce the proposal. My knowledge in this is is very limited and would possibly need some assistance in what information you would need from me.

I have worked out basic costs however, the school would not be required to pay anything towards the running costs of the machine but would need to sign a minimum contract of 3 years. Basically I know the benefits it would bring to the school but need to translate this in a professional manner.