I need help writing IT business proposal

I have recently set-up a small consulting business and have been invited write a proposal for nstallation of a small network. I know I can do the physical job but I am not sure of how I can format my bid proposal to show the various components of a business proposal to handle this. Any experts out there to assist. This is my first job and I want to do it correctly and smartly. You can e-mail me jshiku@zamnet.zm directly or post to discussion