Depends on your basing material - if you use something like wood filler, then you can just use the model itself to press into the filler (allow it to dry slightly first)
Even just making two track wide depressions in the base behind the tank will very much give the look of imprint of the tank moving.
I think Aethelwulf is referring to the actual caterpillar tracks on the vehicle itself, not the tracks it leaves in the ground.
Personally, I had decent results (if not aiming for historical accuracy) using single-sided corrugated cardboard, i.e. with only one side smooth and the other with grooves. Using a sharp cutter knife, this can be cut into long strips with the corrugation perpendicular to the length, and this affixed to the running wheels.
As for the wheels themselves, I'd suggest washers or wooden dowel sections in the right diameter - some craft stores sell wooden wheels with an axle-hole pre-drilled. Given this particular design, you could also use two round slotta-bases to create the centre depression, then glue matching cardboard wedges in at intervals. But that may be excessive effort.
And finally, have you considered looking for a 3d model of the thing, which could be printed by a commission printing service?