Where to start - waterfront mixed use development

[David Minor]

I have located land that has been used until this point as industrial and in my opinion is at the end of its life cycle. I would like to rezone for a mixed use development. All of the properties would total approximately 60 acres of land. 

The city would allow for the rezoning. 

To keep it short - and perhaps to short my question to those of you who have done development like this is where should I start?

Thanks in advance for your advice!