Hosting Website on NAS and connecting it to domain

I have hosted a WORDPRESS website on my QNAP NAS. I was able to access it with the IP of NAS. Today I have purchased a domain. Now please tell me how do I connect the domain with my wordpress site hosted on NAS. I have created a virtual host. Now the site is being loaded, but only HTML files are loading. Other things are not there. Moreover, I cant even login to the dashboard of WORDPRESS. It gives me this error:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at admin@NAS to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

NOW I DONT KNOW WHAT TO DO. PLEASE HELP !!!!
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