Hi,
1. Yes you can set the visibility of the resumes to subscribed users only.
2. You can register as a job seeker or an employer.
3. I am sorry but i could not understand what you mean by "include spaces or change them". Could you please explain in more detail?
4. There are job packs that you can set and sell. You can check this feature in the
admin demo . JobRoller->Job Packs
5. Currently submitting a resume is always free and you cannot set an option to charge for it. You can charge the employer who submits jobs.
6. Custom fields are not supported in JobRoller.