I used to use the comb and some waste yarn, and then knit in a casting off cord. After that I used to start with the main yarn in a false rib with the tension 3 dots up and after each 10 rows move it up a dot (I think). Then you move it down a dot each 10 rows, back to the tension you measured on your tension square.
After that, you need to pick up the loops of the main yarn from the row where you started with the main yarn after the casting off cord and put them on the needles. You then knit the row across, and you then have a hem in a false rib.
From then on, it's all go, and in 20 mins you've knitted the back of a man's jumper. Then, for some reason, generally in the last inch, either the punch card does something silly, or else the whole bloody lot ends up on the floor.
Hope you've got a wool winder, for re-winding all the yarn you need to re-knit <<evil grin emoticon>>
Seriously, the 830 is a good machine, and it's still possible to get parts/accessories for it.
BSK (online) is good for yarns, and there used to be lots of places in the Yorks/Lancs area. Also, if you have any knitting factories near you, they will often sell cones.
There are knitting courses that you take your machine to. Can't remember where though.