A website that is built correctly will NOT have to be submitted to any search engines to get listed. If the process is done correctly, search engines will pick your site up automatically and list every page of your site without any submission service.
The number of pages you need depends on the number of types of products or services you wish to offer, or categories of information you wish to present. This is because in order for your site to achieve effective search engine placement the pages must be designed around key words.
For example assume you are an attorney who practices in the areas of malpractice, personal injury, and product liability. If you give all three of these the same amount of space on one page, and say you mention all three of the key words, malpractice, personal injury, and product liability the same number of times the search engine will see that each of the key words only constitutes 33% of the content of that page and your rating will be low for that page.
By splitting the content into three pages and targeting the page content and the meta tags including key words on each page, you would have a much better chance on the search engines.
Thousands of new web sites are registered with search engines each day, so even if you maintain a position among the top 30 for a period of time, sooner or later your listings will slip down due to the press of new web sites vying for top position.
Periodically you should plan to change the meta-tags and some of the text on your site. The site should then be re-registered so that the search engines detect a change and you are noted in among the new sites for consideration in the search engine listings.
Following is a few of the search engines that still allow free submission of sites.

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