I'm sure other people will jump on you for it so I will tell you politely, browse through the forums and a lot of those questions will be answered
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But I'll toss you some information.
Pretty easy to find a group at the early levels, and more or less at any level. On average 250 to 300 people on a night. Might not sound like much compared to the couple thousand that were on Live but everyone pretty much hangs out in the same spots since they all have played the game and know where the "good" places are.
Auction and Out of Character channels are server wide, so EC tunnle is no longer the farmers market of Norath. Most deals go down in and around Freeport though so if you can't port around then that would be a good place to hang out if you are looking to buy/sell.
There are lots of guilds of various sizes and levels. Look at the Guild section of the forums for some info.
I will let the other people derail your topic with a bitch fit about raiding. Try not to let them get you down.
For the most part people are very friendly and willing to help, though there are still a few that really go out of their way to make you relive the "classic experience" (See: assholes). Never feel afraid to ask a question. We all came to this server to have fun.
Welcome to the server!