Quickly:
1] Summary - what you propose to sell, how much, how it helps buyer
2] Intro - Why buyer needs service...what's in it for them?
3] Service Description - exactly how will you do it? How many people will you use? How qualified are they? How many hows will they work? etc
Why should they give it to you and not anyone else?
4] Costing - how are you charging: hourly? piece-work? and how much? What is the total? Any initial retainer?
5] You company info - type [ltd, partnership or what]? size? how old? where else have you done similar work?
6] Appendices - certificates of registration and taxation; CVs of key personnel; etc
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.