Re: Content : How much is enough?
Having access to available inventory is absolutely crucial, but normally (With any decent IDX solution) that takes care of itself as it is updated daily.
There really is no rule of thumb - it just comes down to what you think "your" users want. Come up with a strategy that builds loyalty. What are your readers interested in? Blog about it - are they wanting market updates, do you have a unique writing style that is engaging, build some reputation by showcasing "you" as a person AND a professional - show your prowess.
In terms of static content (Page not blog) content - there are literally thousands of keywords to target in ANY market, so once you have well converting pages for your main areas - hit up round two for secondary keywords, then tertiary keywords etc - rinse and repeat
Starting LEC 7 soon but it won't be called LEC 7 - LEC 2012 coming soon!