Yes, all manual, including focusing. Yes, you can use the camera's metering. The camera also has a nifty feature called "peaking" that accentuates in the viewfinder the contrasting lines in either white, yellow or red to assist ease of manually focusing. Works well IMO.

Adapters are cheap, $15-50 on eBay. I have them for Leica, Nikon, Contax/Yashica and Contax RF.

If you have other questions I can help with or comment we should take this to PM as others on this forum will not want this digital talk here...