Generally takes upto 24hrs to propagate the domain nameservers. Also, check in your ftp that you have a default page added, like index.htm or default.asp, etc. Other than that, just wait 24hrs.
You can check the DNS from dnsstuff.com, If it is showing correct nameservers and DNS records, then the work you did is perfect. You then may need to wait 24/48 hours depending upon your countryu and ISP. If you are using windows, you can try after firing the below command, perhaps you ISP may have cached your domain's IP address ipconfig /flushdns