rear brake lever

As per title, I want to connect my rear brake up to the pedal, and as I have bought my bike in boxes, I do not know what to look for, or if I even have the part!! I think I am also missing the spring for the pedal. I have looked at various diagrams, but I can't seem to find one with this...

OK first Im a complete Newbie, but on my frame that I have, the only mounts on it are for the engine. My question is what is the easiest/best way for me to mount a brake lever? Is there a piece that is produced that I could weld on? Is there a custom fab piece? Or is the easiest way to get...