What is the source for the timer clock?
Internal oscillator, I think I've selected this properly, but I'm not sure.

What is the prescaler value?
It should be 8 - I hope.

Did you properly enable the timer interrupt?
I tried to. I suspect this is where I need the help.

INTCON reg setup correctly?
Once again, I'm not sure. I tried to.

Do not forget to make the chip .pdf manual your best friend... you must, must, must read it!
I've read this, and other sections many times, but I really am starting from scratch here. I've nutted out quite a few things, but so much of the terminology is unfamiliar to me that it's not always clear.