How to write a letter on preparedness to pay service charges to the school

Dear sir,
Here's all my cash
Huggs and kisses
Me.

Dear School,
Below is a dated list of my income and expenses in the last 12 months, in 2 columns:

Sincerely,
You

Dear School,

I owe you money, and I'm prepared to pay it back. Below (which you will have to do), is a payment schedule for the money owed, and a time frame for when it will be paid back. If this is not okay with you, please write back. If I don't hear from you, I will commence with this payment schedule until you're paid back in full.

Thank you for your time and patience.

Sincerely,

AMSTEADY