I keep all my info in RadiusBob. I don't print files.
Rbob has the easiest SOA. You're already entering in their info as they are a lead so when you hit "send SOA" it auto populates yours and their info.
I have an email template that I send clients with instructions but they just click one box and sign. You don't have to sign. It's already there and the SOA auto saves to their file.