These questions aren't hard.
Concerning the creative aspects of writing a piece:
1. How do I find my own ‘sound’? - Don't worry about it. Write music the way you want to and it'll be "your sound." What might suck is that your sound is derivative, or whatever, but that's nothing a lot of listeninig can't help.
2. How do I get the sound in my head on to the page? - Notes - Ear Training. Timbres/Sounds - active listening with scores to see "oh this is how he did it, I can do similar things."
3. How do I develop an idea/finish a piece? - Develop: play with it, add counter-themes, variate the parameters in ways. Finish - with a sign that goes ||
4. How do you overcome ‘writer’s block?’ - Either force yourself to write or do things to become inspired.
5. Where do you find inspiration? - If you have trouble with inspiration, you're in the wrong business. Read, watch, play, learn. If something in your life doesn't make you want to write, you're not going to write.
6. Which program do you use for notation? - Whichever one you're most comfortable with works to begin with. Make sure you read/learn about score preparation to see if that program can last you to professionalism.
7. Do you write at the piano? - I'm not a pianist. Why do something uncomfortable unless that's the whole point of the piece or whatever?
Concerning the business of being a composer:
1. How do I get my music performed? - NETWORK.
2. How do I get my music published? - NETWORK/DIY OR DIE
3. Should I get my music published, or should I self-publish? - In the Internet age of 2010: DIY OR DIE.
4. What is a copyright, and how do I get my music copy-written? - It is once you've "published" it. Scribd helps. A website helps more. Don't want to "share" because "someone might steal it?" Once it's "published," no one can steal it -- all kinda of timestamps. Then again, if he registers his, things start to get increasingly hairy -- but that's a concerted thief.
5. How do I get commissions? - NETWORK or make your own shows.
6. How much should I charge for a commission? - One idea is a decent wage, the other is nothing. See what they offer, if it sounsd right, then it's right. If it doesn't, then don't take it.
7. Can I make a living as a composer? - You can make it if you try. Like being a musician, it's hard because of the limits on opportunity, but hard work and NETWORKING pays off. Not like I've succeeded or wanted to.
8. What is ASCAP? Or BMI? Should I join one of them? - I honestly wouldn't worry about this until you have a traditional record/publishing deal. Seriously? BMI? That's for royalties management and whatnot -- are you at the level that you're not physically talking to the people playing your music? Why do you need a composition guide then?
Probably why he stopped working on it. He realized he was done before a book was written :P
That's why I want to see this thing -- what question doesn't have a short, koan-like answer that sends noobs thinking?