What kind of programming/computer skill would be needed to build a website like this?

Question

1. users sign up/log in

2. user can post their document to be translated into other languages

3. the poster can preview the profile of translators and can approve access to his/her document or invite them.

4. those translators translate those documents in realtime and get paid by lines(or words)

5. the poster can correct or reread those document if they want, with additional cost with same or different translators.

Thinking of using linux.

Answer 1

If building from scratch, you'd need to know PHP, SQL, and HTML at the very least.  Javascript/Ajax wouldn't hurt either.

Answer 2

You wud need to know PHP, SQL, HTML, (to make it look stylish u need CSS). Also, i would recommend Flash (Actionscript) to make it look more dynamic.