It depends on how much $$$ is involved. What type of investor you are approaching etc.
If you are totally serious, then you should make a Prospectus.
http://www.ehow.com/how_2324110_sell-business-prospectus.htmlThere is a methology on how it should be set up. I have heard you can outsource it to an indian business student.
A friend on my wife, he made a prospectus on a 20 seat call center.
Basically 50+ pages of rubbish.
He wanted $2M in capital. Each share was $10K.
This was in the philippines, amazingly enuff he raised the money in 3 months
