First of all I am a programmer and have really basic knowledge like keywords, titles and content makes difference on SEO ranking. I have a website which is more like yellow pages. I have imported about 40,000 businesses and they have a SEO friendly urls as well they are divided by categories and subcategories.
If I expose all those to google at the same time will they create any problems should I open them to Google in few hundered and with couple of days between them? As this is a large number of pages can Google end up thinking it is a spam website and hence punish it in ranking?
Also my category and paging urls are with query strings ie. ?page=1&cat=12. Can Google crawl those kind of urls? Do I have to change them to /12/1 type urls with Url rewiting?