If you're familiar with using Corel products, they have another piece of software called Ventura Publisher which may have come with your Corel bundle.
When it comes to business publishing,
Corel Ventura® 10 is as powerful as it
gets. It's the only tool you need for
transforming long, complex documents —
including XML files — into highly
formatted and visually rich
Enhanced stability and compatibility
keep your workflow smooth, while
powerful formatting tools help ensure
polished documents. Update multiple
tables quickly with new table tags.
Enjoy more flexibility with XML import
support. And work faster with improved
PDF and printing options.
If you're comfortable with learning some syntax, LaTeX is another excellent option. LaTeX is free and there is a ton of documentation for it available on the net. I'd recommend it if you want the finest control over the layout of your book.