I am working full time in San Diego and buying rentals now to supplement my retirement.

Once upon a time you could maybe buy a book to give you the same generic overview for a fraction of the price of a course. 

DON'T (and I mean DON'T) use one of the "website builders" out there offered by hosting companies, the templates are often very generic, don't allow for much customization and don't look very good on other platforms (phones, iPads, etc.).

I also live in Washington state and am wondering if there is a specific state contract we can use or if we can use any generic wholesaling contract?

I'm currently a page designer for our newspaper, but I'm looking into real estate investment as a supplement to my income (better than just letting the markets handle my 401(k), I figure) and maybe a way to becoming my own boss one day.

These make great supplemental comps and may end of being what you use if the others you picked out visually bust out.After I have my list I try to make sure they have the same bedroom count, within 10% of the sf^2 and within 5 years of age of the subject. 

I got a package containing a manual, some supplemental books with links to Internet resources, an audio CD and the account/password to their private-access Website (deal submission online form and other resources, such as basic real estate contracts in PDF format).

The problem is that you are using a generic ad that has been done to death by every other wholesaler/investor out there.Those we buy houses ads are over saturated on craigslist to the point where it becomes hard to stand out from the crowd.You'll have to come up with something more catchy.

"Bulk" is a generic term used.

The credit check is pretty generic but does give you a score and it has found criminal and eviction records for me in the past.