At anytime during that 7 days you may submit it the Speaker without having any supporter as above. So if you're going to submit it, do it in the first 7 days. In either case, the Speaker will assign it a number and a voting period. A rule is simply a new rule to the game. It can change or amend an old rule or be a new thing all by itself.
Rules can be things which change the game play or have nothing to with it at all.
You can create new objects or places within our imaginary country Nomicsylvania. A subgame is another game created to amuse the players. The rules to the subgames are stated within a rule in our ruleset. These subgames typically affect the players that choose to particapte in some fashion wheter it be an increase in points or prestige.