Domain name strategy, search engine placement, and press releases etc. should all be coordinated and implemented together to gain consistency and marketing momentum. Use of Meta Tags with the appropriate Key Words, optimizing your most important web site content pages and making sure the Key Words are used in the content on the web pages are essential before submitting to the search engines.

If your home page doesn't have any content, is a plan splash page or you are running a flash presentation, then use a different page on your website to optimize and submit to the search engines.

Do Not submit multiple domain names or use multiple domain names for your website unless you have different content and different looks for those domains or else expect to pay the penalties of potentially being band by the search engines as a duplicate website. 

Initially, the cost of marketing is spent up front, then you can perform general search engine placements monthly. You will also want to plan the budget for search engine submissions to update your Meta Tags when ever your add a significant amount of new content to your web site or if you want to be submitted to some of the bigger search engines like Yahoo.