Kyocera fs1118mfp, says adding toner blank paper

Mylar tabs are bent over in feed unit. Push a stiff thin piece of plastic (like a help wanted sign) the same way the paper feeds through.

old printer not really worth fixing

Did you put a new toner cartridge and followed the instructions?
When you say added toner, what do you mean?

Call kyocera's free help desk Monday - Friday 9 am - 6 pm EST at:

1-800-255-6482

you have a bad developer unit

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d

You may need an imaging unit. VERY expensive.

Replace the developer unit and that will fix it.

Blank copies?All sorts of things can cause that, for instance...
Drive to drum broken but paper is being pushed through, same with developer system.Does the machine have "corotron wires" (the wire that charges the drum, then transfers the toner image to the paper?) Check these wires are intact.Is high voltage being applied to these wires? Is there a paper clip stuck in the transfer corotron- it HAS happened-it shorts out the HV so there's no transfer current...
even a piece of paper can find its way between the drum and corotron and the copy paper can slide through and not be printed on! Not sure what you mean by"no any toner or drum it has"?
Does the exposure lamp come on...usually has a fault code if this fails, so unlikely
So...the problem is almost certainly related to drum /toner /development/high voltage areas