Your bikes have freewheels, not cassettes. Torque wrench would not be applicable, because freewheels thread on to threads on the hub, and tighten down the first time you pedal the bike. No need for a chain whip uniess you intend to remove the cogs from the freewheel body as part of the service, which the freewheel may not need at all.

I'm pretty sure your Varsity, and possibly the Super Sport, have one-piece cranks. Serviceable, but quite different from more modern common 3-piece cotterless cranks. RJ on Youtube, as mentioned above, covers the process.