Heyooo! From the self-proclaimed best roleplayer on the site not, I, Delta44, will take to answering your simple yet-
... Actually, after looking through this, I can only reply to two of these questions XD
1. Generally, players interact just as you'd expect them to: one person says what they say and do, the other person replies with what they say and do, and so on. It's very much like having a conversation or writing a story, just alternating between the two character's perspectives. I can link you to some good examples, if you wish!
2. Generally, most people from other countries (I've found) are on at midnight for me, though it also happens often early in the morning. I'm assuming you live on the east coast? Since I'm on the western side of Australia, I'd say your best bet is to get on at either the morning or afternoons, unless you're capable of staying up till it's past your bed time :P Teasing aside, I think Virt or Sky will be able to help you answer these questions. @Virtualide @SkyTenshi
3. Not sure. Maybe imgur? Ask @SpartacustheGreat , since he's hosted images on other sites before (I'm referring to EoN, Sparty)
4. Not a coder at all, and I've forgotten the script myself. You'll have to ask someone who knows how to do that stuff :3 Don't worry - we've got lots of people who are good with their computer skillz. In fact there might even be a guide on it somewhere, though waiting for the other members is the safe choice.
Hope I helped somewhat. :P
