Whats the best way to manage to build complex website like amazon ebay social network site?

I know where to find programmers, but in order to build a database driven website to allow people to trade, swap, buy and sell products in social network environment, whats the best approach? hire project manager first? or hire database programmer, php programmer and designer separately? hire a freelancer knows how to do everything? or use large company? Also what makes website like ebay and amazon so expensive to build? because its comlex or because of large traffic?

Whats the best way to manage to build complex website like amazon ebay social network site?hidden myspace

http://hotscripts.com

Look for scripts that will do it for you instead of trying to re-invent the wheel.

phpFox is the best program to try and recreate a MySpace type social network. It works better than MySpace too, it doesnt use that godawful ColdFusion garbage.

Something like ebay,

http://www.hotscripts.com/PHP/Scripts_an...

http://www.hotscripts.com/PHP/Scripts_an...

http://www.hotscripts.com/PHP/Scripts_an...