Deny user to work with the site untill he/she fills definite fields in his/her profile

initially leave new user registrations at the authenticated user role. Make the fields in the profile field required, and use the rules module to change the role of the user once the profile has been saved (which wont be able to happen until all the required fields are completed).

_{===
"Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime." - Lao Tzu
"God helps those who help themselves." - Ben Franklin
"Search is your best friend." - Worldfallz}