I was recently approached with this situation. I have taken over 2 sites, created one of our own.. and have several landing pages planned, etc. They wanted it done all at once, but I just focused on the core site, then worked one each other item one by one.. blogs need updating, so for stuff like that, you have to plan some time for new content creation.

__________________
Solas Productions web designer at large
CRmercado Costa Rica Real Estate, Vacation rentals and much more.
Follow on twitter.