That's incomplete question. You have to be more specific so we can give you some advices.
What information you needed??
SEO is the last part you need to worry about.
Hosting business isn't for everyone. It requires lot of server management knowledge, good leadership. You need to have really good budget for website design and code (if you can't code/design), then money to advertise, to hire employees and so on.
I am going to start a hosting (NOT FILEHOST) site. any one tell me what is the best seo technic ? :sun: