I want to prepare a mail through which I can create new customers.
In this mail there will be every details about our company and services. The company I workwith is an ISP provider that gives services to other ISPs and enterprise customers.

Hi, joyan!

If you write a draft copy here of what you want to say, without putting any contact information in it, I'm sure that they'll be those of us willing to come along to suggest to you ways that you might make improvements to it.

Thanks!