PHP / MYSQL Help for web based job site

Hi

I have a website that holds information about companies and advertises their jobs. It may not be the best technically but it all works. At the moment it is possible to use the site and apply for jobs freely.

I want to build a membership capability. I want a members area, that you would be forced to log into if you wanted to apply for a job. Each member must provide basic info - name, email etc and they should have the option of adding to their profile to create a complete job seeker profile with the ability of adding a CV and cover letter. They should also have the choice of switching their profile from live to hidden.

The site must be secure because of the data involved but does not require payment options.

The site is UK based and I am open to listen to options regarding the locations issues

I also will want to build an employers search capability but at this point this is not in the spec.