Hi itmccb,
If you're interested in film photography, and you have never owned an SLR, you should... There are things only a RF will teach you, but IMO you'll be more prepared to perceive them after seeing through the lens for some time... THEN you'll know it's the real world what you need to look at... But an SLR (Nikon FE2, cheap, great) and a 50 1.8 (Nikkor, cheap, great) will be as important -at least- to your photography as a RF will be... Using both is a good advice.
If you decide to use ND filters, use the common ones... Simpler... They're good with RFs especially, as you won't see through the lens+filter... But with a 1/4000 SLR like the FE2, you won't need ND filters if you use the appropriate ISO film for the light you're in...
Light meter! Write down data!
Good luck!
Cheers,
Juan