First Draft of the Book is Essentially Done

I am just going to go ahead and say that the first draft of the book is done. Essentially. The only "real" section that I haven't written is the forward.

Unfortunately, now comes the work of the second draft:

• Several sections have to be majorly rewritten. Most sections have to be lightly rewritten. Repetitions have to be moved and consolidated in their relevant sections.
• I'm going to go through all of the research I went through the first time, as well as additional research I have collected in the last 3 or 4 years, and see what I need to add or correct. This may result in a new section or two.
• I'm going to take a lot of the fun contents from my blog, create many more similar content items, and add them as flavor between the sections. Raph Koster, I'm looking at you. :-)

 At what point do I start looking for a publisher? Or do I first ask for people to review and critique?

Yehuda