I have a question about the best way to go with regard to best results in Google. I suppose the answer might be no real difference or even god knows.

I have mostly started my sites by putting on a few of pages and developed the site, page by page until they are a bit bigger and more rounded.
Is it better to launch a site as a more substantial entity and then open it up for indexing so that say 12 good pages are there from day one rather than 3 that would grow to 12 in say 3/4 weeks.
I would imagine the bounce rate has a good chance of being lower if there are 12 pages from the start but apart from that???