I actually used to waitress and host at Ruby Tuesday. My Best advice tips are these:
-Always be friendly and smile and say "Hi" to each guest.
-When not busy, help the servers buss their tables, since you normally do get a tip share from them at the end of the night.
-Helping roll silverware if it was needed, and the managers permit, was always a plus.
-When you see the different sections, make sure you seat all the servers equally. Make sure they all get sat tables fairly, and don't double and triple seat, as that will piss them off (don't seat them two tables back to back).
-When taking down names, ask for a last name, party count, and what kind of table they prefer.
-Show interest in the menu and the restaurant, and before no time, maybe a manager will promote you to a server so you can make more money!
Good luck, it'll be easy.