If I had enough shows, i'd go all week. starting at 8pm
First of all, I wouldn't air the movie or that Lucille Ball thing.
I would try to air the first-run episodes if I could afford them and get permission for them.
Throw in some retromercials that were on during the run of the series
I would air the spinoffs: The Roper's and Three's a Crowd.
I'd throw in some Love Boat and Fantasy Island episodes in which
the cast members made guest appearances.

1-4 on saturday and 5-8 on sunday

I think I would have done is not have so many commercials where you miss the last few minutes of an episode at the end of the taping.

Fewer commercials, every episode, movie and show related to Three's Company in existence, including Three's a Crowd and the Ropers spin-off. I'd run it in order from the very first episode to the last.

That would be too perfect though. Not gonna happen.

Might as well show the British version, too.