zenza bronica etrs

Recently I've run into some issues with my Bronica ETRS and the issue seems to be getting worse! I have 2 film backs and 3 lenses for this camera. I have been switching between B&W and colour with the 2 backs. Now that I've started processing my photos I can see there is some kind of exposure...

Hi! I received the body of a Zenza Bronica ETRS from a pro photographer friend, and wanted to know what the best way is to proceed from this point forward. To be clear, I only have the body and stock flip up viewfinder. I am aware that at the very least I would need a film back, and a lense...