Q. What resources should I consult in order to be certain that the UN Proposal I wish to submit is valid?
A. There's a sticky topic on the "United Nations" board that talks about UN proposals; it strongly suggest that it be read before submitting. Remember that you can be permanently ejected from the United Nations for submitting multiple bad proposals.
If you've written up some text for a proposal, but you don't know if it violates game rules, then post it to the "United Nations" NS board and ask about its' legality *BEFORE* submitting it as a proposal.