Hi and welcome to the forum.
I think what the guys are trying to express in response to your question(and correct me if I am wrong guys!
) is that before you even think about doing restaurant walkaround--you should already have a routine in place before even considering approaching anyone.
Now you state in your opening post that you have already started doing magic in restaurants, which means you must already have some kind of routine in place. Perhaps you could explain to the guys what tricks you are already performing so that they can give you recommendations to expand on your current routine.
If you are just starting out and "stumbling through it" and if you truly do not know what tricks are good for this venue, then sadly -- and I mean this in no way as hurtful -- you are not yet ready to perform in a restaurant.
Try doing a little more research. Investigate and invest in some DVDs -- or better yet, some good books, or both!
I wish you luck in your endeavor.