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As for google indexing flash sites, or pure flash sites - "forget about it" :)
You don't need to submit to Google, but it does no harm.
Google likes to find pages via links. If you have good links to your site (from reasonably high PageRank pages) and if your Web pages are accessible from the home page using normal HTML links then Google should find them easily.
Having Flash in your pages shouldn't matter, it's just important to have HTML links as well. Google may load Flash movies and look for links in them, but I would prefer not to relay on that as other engines won't do that, and neither will all people (no one in my office can load Flash without intervention).
About the flash im not too sure...from what i hear its not too good for google and probably wont rank too great. Google likes content as in text content! you should probably start thinking of adding some pages with lots of text to complement the flash (if you have to use flash)