I don't think there are specific rights and wrongs to communicating at a field. At our field it's an understanding that we announce (yell) our intentions ie.. landing, taking off, touch & go etc...

Beyond that it's on an individual basis. Being new to the hobby I generally try to ask lots of questions and give little advice. I know several people who don't mind at all if you stand beside them while flying and carry on a conversation. I know some people who it's best to keep your distance from while they are flying. I asked a guy the other day if I could stand beside him and watch his hands on the sticks while he flew. He didn't mind. You'll just have to get a feel for who flies at your field and what types of personalities there are. Some people go to the field more to hang out and talk with others than to fly. Some show up, fly, and get the heck out of there in a hurry. Some spend more time helping others than flying themselves (and prefer it that way). I hate to sound like a kiss a** but you can't go wrong ooohing and ahhhhhhing over everyone's airplanes and flying ablities.

Before too long you'll make a few friends and start seeing yourself more of a regular than as an outsider looking in. You'll be the one making inverted low passes over the runway while 5 people stand behind you yelling "lower!" all the while. When that happens you'll know you've arrived.