The licenses are pretty clear, I don't see why there would be a difference when making a [genre] game than from any other [genre] game. If you make over a certain amount of money ($5000) with the standard license you'll have to pay for a business license.
I have seen this situation numerous times. If you are new to developing games and young, I'm not sure you are but it seems that way to me, then making an MMO would be as Phobos said "insanely difficult". Not exactly impossible, but improbable at the very least.
An MMO is an incredibly intricate thing to make, on top of actually building the client you'll need to maintain a server (getting C2 to speak to the server is only a small part of the battle there).
I suggest starting small. Make test games with game mechanics similar to what you would like in your MMO. Then gradually work upwards, trying to get two people to connect to the same game, then three, then four etc. If you try to do it gradually you'll have more experience to take from when trying to do the "real thing" than if you just ran into it headfirst.
This isn't aimed at Construct but I'd say it's a good read.
Also, for future reference, writing in all-caps does not really help you get people to read your posts. Probably the opposite.inkBot2011-09-08 03:26:01