I want to put a freewheel on the other side of my hub. Some basic questions: can I just thread it on by hand or do I need a special tool? Which side of the freewheel is supposed to face the hub (the flat side or the side with the raised plastic)? It says it fits 1/8 or 3/32 chains; how can I tell which of these are on my bike? Can I just use chain lube as the grease or do I need some of that green grease prior to installing it?

Thanks for the help