For the flash stuffMake an HTML page embedding the flash stuff using the OBJECT tag
For the start/home page this would work
The button the Home button goes to will always be index.htm. Make this
The page when the e-book loads, create an HTML page called something else. In Edit Add-Ins, for On Start write
##NAVIGATE('{ebook}\something.htm')
Where something.htm is the name of the new initial page
HTH