1. The terms and conditions can be mutually agreed upon by both parties but should be be less favourable than those in the Employment Act, like working hours, rest days, etc etc.
2. From what know, the employee still can opt whether to contribute to EPF or not. In this matter, I think you should contact EPF and get advice from the officer there. Give them a call.
3. SOCSO, the employer will have to make the contributions but not the employee Again, contact SOCSO to confirm.