MYTHS ABOUT INDEXING, CRAWLING AND SUBMITTING
There is need for doorway pages.
It is completely outdated and an obsolete practice.
It is true that frequent spidering will improve rankings.
An Absolutely wrong notion. Frequent spidering means your site is frequently updated.
Your site should be updated frequently.
No need to do it. Some sites does not require update at all.
A GOOGLE SITEMAP is an absolute necessity.
It is not required for average sites. The rank of your site will not be improved by it. But it will help to get all pages indexed.
You have to submit your URL to search engines.
The truth is that search engines will find your site and index it if you provide a link to your site.