Newby needs advice

Hi all - new kid on the block just got a 1978 classic rangie, need direction to info that helps me identify intechangeable parts and model chnges etc, a source for a workshop manual for that model also would be great.
meantime - cant find how the washers switch on -- really am that green - all help and understanding appreciated

welcome propsail,someone will be along soon to help you with the question,SIR RATTY where is you.