Ok, this is my first conversion of any kind and I need a little bit of help. I picked up an old Fuji and I need to get a new single chainring crankset and freewheel, but I'm not sure what kind. Everything is stock 1970's Fuji. (Sunshine Hub not sure of bottom bracket)

Soooooo, without further ado...

1) Do I need to get a specific kind of crankset to fit my bottom bracket?

2) What kind of freewheel do I need to fit my hub?

3) Any suggestions on inexpensive parts for this conversion? I'm not looking for the cheap stuff, but I really don't need the "nice stuff."