Alex, as far as the 'nuts and bolts' go I can recommend Lulu.com for on-demand online publishing.
I've just finished editing a 320-page softback perfect-bound autobiography, and the finalisation was relatively painless despite my fears: all text and images done in Word (not too much cursing and swearing at the program!); uploaded to Lulu after signing on; they create the PDF which you can D/L and check; select a cover or upload your own, click OK and it's done.
The Lulu covers are a bit basic ..but you can create a bit of artwork in PhotoShop or whatever (to upload as a PDF) if you want full control and a wrap-around cover (front, spine and back). There's even a calculator on site to let you know how thick the spine will be for a given amount of pages so you can get the cover dimensions right.
One further step (which requires adhering to certain publishing standards) is to have it ISBN'd and available on Amazon.
The book I did is here:
http://www.lulu.com/content/2457923 Anyone can order a one-off copy for this or any other Lulu book (my one's USD16.95) and have it delivered to them in about a week.
We're all looking forward to reading yours!