French SEO

[a.rypinski]

I am creating some webpages in French to propose our services to French people and get indexed in French search engines. We basically provide incorporation services for new companies.
http://www.getincnow.com
I was wondering if it is necessary to get a French domain and if we should have our relative URLs in French to get indexed in the search engines. I am not so sure it is necessary because only a few companies propose to French people to incorporate their business in the US. So far, I have been translating only the content.
Also, a lot of words have accents in French and I wonder if leaving the accents out will affect indexing.
Thanks