Hey, I wanna claim Administrator Yota!
Advice good gives he.
A few points:
Wheter you produce housing or trade goods, it doesn't really do anything if you've got no production on the planet. So, e.g. "Gary I" doesn't benefit at all from you chosing housing in the production queue.
The surplus food is sold automatically, regardless of what sits in the production queue.
Consider the research lab technology in the "computers" section - it might help your clueless feudal scientists actually do something.
Also, about research - you can change goals at any time, without losing the accumulated research points. The pool gets reset only when you actually discover the tech in question.