Great question, and I've already seen some great answers so far.
The best place for me has been the SFI support tab. There is an index and you can type virtually any question you have and find the answers.
Then, obviously your sponsor or co-sponsor and finally submitting a ticket to the SFI support team if those other methods fail you.
AND, you can always ask me :) Of course we each want our downlines to succeed, but still we are all here for each other and want all to succeed with SFI so it continues to grow! :)