I stumbled across a RB67 Pro S body w/220 back today for $20.00! No lens and no viewfinder. I know there are tons of lenses and finders out there but I have some really basic questions. What is the first lens I should get? What about a viewfinder? Where does the power for a flash come from? How do you set the ISO? I guess you have to use a hand held meter? I got a couple of roll of color film so when I get a lens and a viewfinder I can have some fun!