Ok I need to ask you some questions about your site.
1. How is it built? is it using a standard script, is it actually selling properties etc?
2. how far along are you?
3. what properties and more importantly WHERE are you selling them TO and FROM i.e. I am in the Uk, we have a realty site in America that sells properties IN florida TO people in the UK.
Finally you don't have to submit your site to the search engines (although you can, just search google for submit site site:www.goole.com
all you need is to get some links to your site for the spiders to pick up on an add to the index. Sometime soon then the spiders will be sent over to your site to spider it.
As I said previously though real estate is VERY hard to rank for and you are unlikely to achieve it with one single site and no budget or no knowledge of in depth SEO. People are apaying $20-30,000 or more to get real estate sites ranking highly.