In urban, congested areas I monitor frequency a bit to see if I'm not stomping on somebody, then identify, than go chat, keeping it short and to the point. When done, identify again and say "frequency clear" just as a courtesy to others. In the woods I (or my family) identify then go blabber away till the the batteries drained, identifying when remember. I have yet to stumble on other GMRS user in Sierra foothills in close proximity. When talking to family the one who starts the talk speaks the callsign, and the one who is finishing the talk identifies too. Regarding specific words and meanings, the rule I go by in face-to-face, email, online forums and radio communications is: do not be an --- to others, and there is a better chance others will do the same to you.