My first pair of Tele skis was an old pair of 200 cm Pre 1200s, painted white, that I'd pulled from a dumpster and mounted up. I called them the BR-549s. In case you don't see a pair of generic skis poking out of the local trash heap, I'd recommend picking up a cheap pair of moderately shaped skis in about a 180 length.
I'd also recommend that you learn with a fairly high stance and avoid dropping your knee all the way to the ski - its a really bad habit to take out into the back country where it increases your chances of hitting a rock or snag with your knee.
Just wait until your first day with a few inches new.
"Telemarking - it gives you a license to spill" - AH
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse