Are they fold stamped? Do they come with a fold?

These are flat cards that measure 5x7 inches, they are not scored or folded cards.

I want a 5x7 postcard to print linoleum block. Maybe a card with some texture is best.

We are sorry but we are unfamiliar with this technique, so we are unable to recommend what type of card stock would be best.  Feel free to request a few samples.

Can the white cards be printed on? I would just like to print some text in black, not print photos on them. thanks

They can be printed on as long as your printer can handle the size and the weight of the card stock.  We, too, can print on 5x7 card stock for you.

I need a fine photo quality finish for A7 folder note cards

We would suggest getting a sample of the Cougar A-7 Folded Cards.  It is a super smooth card stock, but it is not a coated gloss card stock.  

what is drilling

It is basically hole punching that we do with our paper drilling machine. This allows us to hole punch a larger stack.