If Andrew Gower can do it then you can! You just need to be persistent - about 5 years before making any money, but when you do... $$$$
The keyword here is dedication. If you want it enough (and you have no social life) then you'll succeed!
If you work really hard and spend the money you need to spend, you might
succeed if you get lucky
I'm not saying you shouldn't try. I'm just saying that you won't necessarily become the next John Carmack overnight. First, learn a programming language (preferably Java). Then, figure out how to make games with that programming language. Then program some simple games. Then program a single player RPG. If, after all that, you still want to program a MMORPG, learn about networking, buy a server, and program your MMORPG.
Some books to read (after learning Java):
Developing Games in Java (by David Brackeen)
Killer Game Programming in Java (I forget who wrote this)
They're a little bit dated, but they're the best sources I know of.