One thing you should always consider when creating a new website, especially if you plan to monetize it later - what value/benefit are you presenting to the users.
As far as I see its a simple lookup tool, but there are plenty of them already, all having the same functions, and even more. I would personally first start thinking what unique features you can provide for your visitors and then think about monetization
Good ways to monetize a whois look-up site is to create affiliate partnerships with Sedo, Godaddy and some of the drop catchers. But as @Rado_Ch says, focus on your product first and try to create some traction. At this moment i don't see why i would use your site instead of Domaintools.com (to just name one example).