My Company has bought 10 domains. we are into online bookings. presently successfully operating with one site. we wanted to spread our services to 50 other countries, and the management had bought 50 domains for each country( .uk, .us, au etc to give localized feel to the people of these countries when using our sites.).
the main bothering i have is "how to manage these 10 domains"?

1)can i link all the sites with one another, and do bookings from any site. ( i.e from .au site i want to book for Aus and also for other 10 countries) similarly we want to provide every service we have with us on every website of ours. functionally they'll all be doing the same task.All will be operating from the same centralized database.
does this have any duplicate content issues.?

PLEASE suggest me the best possible way to link and manage my domains so that there won't be any complications. Also suggest me the the best SEO strategy to follow?