You should be an experienced PHP and and MySQL coder. The timeframe is two weeks.
Heres some help: Open Source Bitcoin Marketplace Software
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Something similar to how Silk Road and Alpha Bay are designed
It is recommended for the coder to visit the current Alphabays Marketplace to get a look and feel to the recommended functionality.
this will be used for legal transactions.
There should be a possibility for a user to register either as a vendor (sellers account), or a buyer (normal account). A vendor should be able to upload pictures and info to his items.
There should be an Escrow functionality. The site should get an adjustable percentage of the finished deals.
There should be an admin panel for maintenance, resolving disputes and support.
There should be a Bitcoin handling mechanism. It is recommended to run Bitcoind as client only to connect to blockchain.info. No blockchain download, no local wallet. 
The suggested achitecture is a LAMP-stack, but other sort of arrangement could be possible as long it runs under Linux.
The forum part will be a ready made forum script and not required to be coded.
There should be three types of access permissions
Administrator: Access to every part of the site.
Support: Access to read and reply to support tickets. Resolving disputes, only access to funds placed in escrow.
User: Access to own account only
There should be no captcha on the site. A user should instead be UNIX-like blocked from access after 5 failed login tries for 20 min.
All EXIF data should be removed from JPG's when uploaded to the site. 
The menu and sub-menu items
- Become a seller
- Withdraw to account
+ Possibility to filter
-Domestic -from- -to-
- Shopping cart
- Escrow mode
- New Orders
- Accept Orders
- Sent Orders
- Finished Orders
- New message
- 2-FA GPG - Two-Factor GnuPG for Two-Factor?
- PIN For all user for withdraw money any user creat the pin FIRST TIME WHNE CREAT MEMEMEBR
- Report a problem
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Note the time frame is NOT two weeks, this is what i was looking for at minimum.
ACUTAL TIME FRAME: 1 - 3 months