OK, I don't want to sound like an ass, but here's my (negative) comments:
Firstly, I have to agree with BDthemag. I'm a high master lurker here, and I have noticed that you, adwarf, tend to create unrealistic goals for yourself and never actually reach them. The Fallout pnp and some Oblivion RTD (CMIIW), among others, are the projects with big aims and no future I have in mind.
I'm saying this not to discourage you, oh no, jsut to point out that in teh long run you will be wasting time and energy chasing after unreachable things. And I do understand that this game might be one of your dreams, but it is extremely complex (something that would give doubts to even a skilled programmer) and, as you stated, you have never done any coding. Think about it. It might take a month to grasp the basic concepts of programming. Three to four months to memorise all the functions of a language. And at least a year of constant programming exercise before you finally do not feel the need to open up the documentation file to look up how something works. Even if we're optimistic and you do mane to master the language, starting from zero, after a year, only then you can start constructing the engine - after all, a game as complex as your simply requires major structurisation (? grammar nazi, I choose you).
Well, enough with the flak. My advice would be to keep your vision in mind and not to expect to begin actually coding the game (that is, writing functions that wouldn't be scrapped after a short time due to your rapidly increasing knowledge of the language) in the following year. Start off small, read a bunch of tutorials and work every day.
Finally, I highly doubt that you will stick to your idea for long enough. I mean, I'm a lot like you - a walking bag of concepts. But now I understand that they're just that - some thoughts and ideas. In my case, they disappear if I do not start expressing them the day they come to my mind. Sure, this game might look like something you could be working on for the rest of your life, but, believe me, in a young age things come and go.
Enough ranting! To sum up, sit down and rethink this whole thing. Does it have any possibility of seeing the light of day in the coming year or two? As I see it, this just might become one of your 'the higher they are, teh harder they fall[out]' ideas.
(sorry
it's late and I don't feel like going to sleep yet, so I have to kill some time)
(also sorry if it's incomprehensible)