When I get a new affiliate. The welcome letter I send has the following:
1.Welcome them to SFI and my Team.
2.My email address, phone number and home address
3.I let them know where to begin: START SFI BASICS LAUNCHPAD
4.The To-Do List
5.Most important let them know that you will be glad to help them with what ever problem they are having.
6.I let them know that I look forward to working with them.
I don't want to overwhelmed them with a lot of information in my first message to them. SFI has an example of a letter on this page:
https://www.sfimg.com/Training/IntroduceYourself