All I can say would be to work up a persona that fits with your race/class selection and stick to it, say things in /say that your char would say, if you need to speak out of char preface with an /ooc or use the ooc channel or a /tell. What ever works best for you. Using the supplied SOE cultural history is a good base, but you can pull in your own ideas just the same. Companions of Norrath have created stories that have developed "organizations" that some of us like to use in our roleplaying, you can see more about those at our
guild site. Most of all, have fun with it, that's why we're all here. Hope that helps