Help a Newbie with Large Format Outing

[durr3]

I recently found an old Ansco wooden large format camera and want to go try it out today. It has 3 backs with it and one of them is a B & J 120 roll film back. I have some 120 and 220 film, so I guess I will start with it.
I have 3 lenses. Ilex Paragon10" (254mm) f4.5; an Ilex 6.5" f4.5; and an Ilex 8.5" f4.5 Series S lens. Which one do I use for landscape type shooting? And which one would be best for portrait type shooting?

BTW, the Ansco has an Ilex bulb tube type shutter that appears to work on B and I.

Any advice?

thanks

[Mark Fisher]

All of those lenses will be considered "long" for any 120 format image. Since it sounds like you need long exposures (I'm not sure what exposure I would be...1/30?), the shorter lens requiring less bellows extension may be easier to use. I'd just use the 6.5 for both to start out.