The front decal would normally have the mixing instructions, but yours may be faded or worn away. The mixing ratio is 16:1 or 8 Oz TCW-3 two stroke oil to 1 gallon of gas.
The model and serial number are normally stamped on the powerhead at the rear of the port side, just above the base gasket.
If the motor has been sitting for many years without service, then the flywheel will need to be pulled, and points will need polishing and proper gap. If you are lucky, the ignition wires will still be serviceable.
The carburetor will likely need servicing, with new primer washers, float, check valve, and fuel line cleaning.
The rotor style water pump, will also likely need replacing, along with fresh 90W gearcase oil.
Here’s a very helpful site: http://pochefamily.org/outboard/
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