My dad gave me one of his Montblanc pens, but I didn't think to ask him a few questions--I was wondering if any fountain pen users out there might be able to help.

What is you favorite brand of ink?
Is there a way I can figure out the date this pen was made?
Best way to store it?
Can I change ink colors if it's only seen black its entire life?
Should I take the tarnish off the pen (it's silver)?

Thanks for any help.