Hello welcome to NoScrubs.

Here are the answers to your questions.

1) The max level is 75
2) Yes it is easy to level up alone if you do all your quests and the daily quests in the extra PVP maps like Twilight Quarry and Nights Forst
3) Its very easy to level up and shouldn't take you that long to do it depending on how much you play
4) Yes there are quite a few people on. Its hard to say an exact amount because it is always changing.
5) Enchants usually come more from Dungeons. Since you are probably still too low to do those solo. Either find someone to take you along for a dungeon run, wait until you are higher level and solo them when it is easier, or just buy them from either Nojaque or look in the Auction House. I have been known to sell both by the 500s
6) Quests are the fastest way to level. You MIGHT have to do some grinding when you get closer to 75. Depends on how willing you are to do the daily quests in the PVP maps and the daily wanted papers.
7) You earn alot of money from doing quests. I would worry about levelling up first and save all your money. But make sure you do things like pick up all the equipment that drops, and start saving up extra. Once you start going on dungeons solo, money starts coming alot easier. I have over 2 billion and still counting.
8. See previous answer
9) Whatever class you pick depends on your playing style. There isnt really one thats "easier" than the other. But i suppose gladiator isn't that bad to learn.
10) Duel box as in multi client, yes. Please see my post Rules and Regulations for some extra info about that.
11) We basically shoved everyone on one server. And there is only 1 channel. Its been that way for quite a while.
12) Class change is level 30, same as retail.
13) Please see my post on Rules and Regulations to see what you can buy with tears. Tears can buy most of the cash items from retail.
14) There are the standard PVP maps. Conflict Valley, Frozen Nest and Spirit Shelter and then there are extra PvP maps that arent Pvp in retail. Twilight Quarry, Night's Forest Nightfall Shelter, Corrupt Valley, and Colossus Snowfield. When you go to any of these maps, you do not have to worry about everyone attacking you. There are level limits as to who can and cant attack yu. I believe its 6 or 7 levels above your level can. And you can attack someone 6-7 levels lower than you.

Here is the link: http://noscrubs.net/forum/12-general-iris/18425-rules-and-guidelines

If you have anymore questions, just send me a message and feel free to add me to your friends list
Hope to see you in game soon.

You can check the amount online at http://noscrubs.net/iris/whos-online
We usually have around 160+ players on in the morning to early afternoon and around 120 or so in the evening. Quite a few are AFK collecting the 2 tears you get every hour. We currently have the 2nd channel switched off so everyone is together.

PvP is open world on the maps mentioned by skatergirl, and the two battlegrounds of which there are 3 per hour.

You shouldn't have any problems gathering money, tears or anything else you need here, just don't expect to be able to get everything within a day and you will be happy