No, you won't put two stroke in the gearbox. You want a gearbox oil... not car one though.
Spark plug help:
http://www.aa1car.com/library/reading_spark_plugs.jpg
welcome aboard! That's some serious eye candy those first three bikes... and I'm sure they're just as fun to ride as they are to look at.
Start projects in the workshop for the others if you like. We like to watch.