[header] How to be an upstanding member of a sports card online community [title] Make an introduction. [step] Most online forums will have a section of their forums dedicated to just introduction posts. Tell them your name, where you're from, what your favorite teams are, who you collect, and throw in one or two interesting facts about yourself. 
This will make people interested in who you are as a person and not just as a collector. [title] Make a banner to put in your signature and add an avatar.