there is a place called allen marine service in salem. they should have everything you need or will ever need. make sure you get the plugs for your motor. outboards are plug specific. As for oil get lower unit oil. brand doesn't matter too much but everyone has there favorites.
I have a set of tune up manuals that cover most 1955 to 1983 outboard motors. I will have to go shovel snow and see if I can find some specs for you. I know I have information on 1978 15 HP Evinrude, because I have one LOL, I don't think they changed much in one year. If I remember corectly most of the motor specs have a range of years they apply to.