I don't know anything about the glass cook tops.
With gas, I know the size doesn't have to match. With what you are canning, you can water bath, so you can buy a MUCH cheaper canner.
Tomatoes are easier to can than jam.
Neither are "hard" though.
I have used gelatin instead of pectin when making jam and I have used the Ball pectin. Just because it was there, easy to find.
I would just go ahead and get the ball canning kit that has the jar tongs, the air thingy, the magnetic lid whatchmadoodaddy, and the jar funnel. All helpful.
Jars, lids, rings and you are good to go!