404 Error on new domain

Sounds like you are missing your .htaccess file?

I have seen hosting providers that have configured their FTP server to hide files starting with a dot in the filename. If you have copied all files from your main domain to the subdomain (for development I assume) you could be missing this file.

So if i do add my htaccess file what should i put inside? Or there doesnt need to be anything there? Ive only really worked with htaccess for WP speed optimization.
Thanks you for your reply diederik