A novel idea...

I have always wanted to write full time someday. A novel bearing my name as the author on the cover page has been a fantasy for a while now! But even if I can think of a story line, I wonder how can I make it into a novel. Sometimes I think I should write short stories and publish the compilation. But I cant get any new story. I can clearly know where the story is coming from, inspired from some readings, somewhere in the newspaper. It doesn’t seem original. Are there any original stories I wonder. So far I have written only one story and am quite proud of it also. But it is heavily drawn from experience. May be it must all be drawn from some experience, not necessarily one’s own. I remember distinctly that I could not sleep that night properly when the idea of the story was born. I had this urge to switch on the light and scribble something on paper. The next day when I got to office I was feeling very restless. I finished the morning work with great fervour and stretched the lunch break to put it in black and white (typed it I mean). I never ever have experienced that feeling again. That restlessness to put it down on paper, that flow. I also have another problem, until I feel very passionately about something, I can’t write something interesting, it will be very mundane and boring. When I re-read some posts much later I can clearly tell what made me write which post and I like the ones which had some deep feeling associated with them. Like the words had to come out at the time to provide that relief. I have read autobiographical works by R.K.Narayan ("My Days") and Somerset Maugham(The Summing up), who happen to be my favourite authors. These people used to spend hours everyday writing, reviewing and reading when they became full-time writers. I have heard people travelling to far off places and write in seclusion, like I read that Kiran Desai went to Mexico and stayed there for long while writing the book “The inheritance of loss”.
What gives them ideas? Are they just more observant or do they travel extensively and seek newer experiences? Are there characters a combination of many real people they have met and not purely imaginary? From what I gather from my various readings, some writers socialize to get more ideas/subjects/stories and once an idea gets into their head, they confine themselves and start writing...
How does it all work? A restless person like me will become crazy if I turn into a full time writer and have a writer's- block! huh, scary thought. What do they do and how do they reinvent themselves as writers? How can they spin stories after stories without repeating themselves? I wish someone could help me with that...And wish I get a novel/book published by the next Olympics! Hmmmmm nice thought!