aortic valve replacement with On-X prosthetic mechanical metal valve

Hi all I have aortic valve replacement with On-X prosthetic mechanic valve 6 months ago. I'm 29yrs. I m on 4mg Acitrom (equivalent to 8mg coumadin) and 150 mg aspirin a day.

What u will suggest for me regarding INR Range, Daily walking miles, blood test frequency , heart echo frequency, daily routine , experienced any problem related to this, any event etc.

Also i m taking 150 mg vitamin c capsules for 14 days of which 7 days left due to my eye lid surgery. Is there any adverse effect on anticogulent therapy.

Please help me. I will be very thankful to u.