I think that when you invite someone to your town who opens by saying " I just joined the server today, anyone got a town I can join?" you take a risk. While I was once a new person to the server, it is not hypocritical, it is true. So when you invite someone to a town, you always take a risk, but it is even greater when the person has not played before on a multi-player server.
So, to answer your question. If you ignore town rules, you should be warned and if you fail to follow, you should be kicked. Pretty simple.
I would suggest that your rules as you have them written above could be clarified. What is a "floor", If I build a three story tree farm for jungle trees, have I broken the rule? That is just a suggestion to think about.