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I have a bike that's basically pic related: 6 speed freewheel, revoshit and so on. Works well, except 14-28 for me is not enough, and while I have all the tools to install a FD and I've done it before, the frame doesn't have the cable stop and the bottom tube isn't good for adapters.
Based on the mileage, I would say 8s for me is more than enough, Sunrace has got a Shimano compatible threaded FW which is 13-15-17-19-21-24-28-32 42-13. 42/13-15 is good enough for pushing, 42/32 would let me climb walls. 42/28 is good for most hills but not all of them.
All the internet guides, especially Sheldon's, are the shits. A LBS told me he'd just rape my frame and shove it in, another more popular LBS told me the Sunrace 8s freewheel would just fit right in, while the internet tells me it fits or it fits and I have to spread, or spread and redish everything, center the axle etc.