First thing you want to keep the machine moving you want to start
pushing the machine before you advance the lever. Before you run out
of room you retard the handle all in one fluid motion. You start left
to right with the drum sander and then flip sides.

Start with a 36 grit and us a medium grit and then a high grit 100 or
so

Then some back with a square buff sander and do the edges with a 60
grit and then 100

You might have to come back with a hand square buff and do some edges
and door jams.

I would pull quarter round and trim so its a more complete job.

As for staining and sealing that is a little bit more complicated

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