Multiplayer: Pro Edition Server Capacity and Game Setup

I'll apologize in advance for the numerous questions that I'll be asking about Gamestudio (I promise to use the search feature before I post); but I am very eager to start learning more about the program.

I'm going to order the commercial edition today, and I was interested in creating a quick multiplayer game to familiarize myself with the software. Keeping in mind that I have absolutely NO experience in game programming or commands; I was wondering exactly how hard it would be to create a multiplayer game (one team against another) in GameStudio. I was planning on creating the level [scenery] first, and then the characters and sprites; and then work on adding the multiplayer feature.

Also, I wanted to know, when upgrading to the pro edition, the difficulty, if possible, of making the game capable of accepting up to 2,000 or so players online. Not all in the same room, but multiple rooms to join; each room would accept say, 16 players. I also wanted to know the steps; i.e. if this required thousands of lines of scripting to make it possible; and exactly how much money it would cost to run a server with 2,000 people; if it costs money to keep it running. Many thanks for helping out with my previous questions...I'd greatly appreciate some information on this matter.

-Kravenwolf