Graphic Design Copyrights

I have few questions regarding the copyright of the vector images I create.

1. 
   

   Can an individual (not a Company) hire me as a "Work-For-Hire" Agreement?

   
   


2. 
   

   If it's written in the Agreement that any work I make shall be transferred in his propriety (along with the copyright), can he later sell, comercialize and do whatever he wants with the graphics?

   
   


3. 
   
   

   I assume I'm not allowed to re-use the graphics I make since they are under work-for-hire agreement?

   
   

Thank you!