Well you should first know all or most about sfi to be able to sell it to some one.A good letter is a honest bright one filled with excitment about the business.It for me should have the following:
1-A bit of history about SFI
2-A bit on the training that are here on the site
3-tell the persons about triple clicks and the ways to make money from it
4-other ways of earning income from sfi example sponsoring,etc
