I guess it all depends on what type of riding you plan on doing :confused:
Your profile says you ride a 250 and since you broke your collar bone falling off a tabletop I would guess it's mx.
From my limited experience with 250's I would say you'll use the clutch less than I do on my 125. I primarily use the clutch (slip or feather) to keep my rpm's up into the power band and limit the back wheel from losing traction. As far as just up & down shifting I rarely use it. I find that it's a little more difficult to just stomp it into a gear while on the power and I seldom use that approach, being somewhat of a technical minded person I can't see the need to force and unsynchronized shift. If you slightly let off the gas while upshifting it does no harm to the tranny and will shift easily, for downshifting you can kind of gas it while shifting and it too will slip right into gear. On starts for MX I normally use the clutch to upshift and keep the power / gas on, if I don't use the clutch I usually miss a gear.
I hope some of this made sense.
About wheelies, I would recommend getting use to your bike, learning when it hits the power and work at it slowly. You can help it come up by pulling up of coarse but you'll want to keep your feet on the pegs. Instinct tells us to put our feet down when you pass the point of your center of gravity but that will certainly result in a get off. Use the back brake to keep from looping out and roll the gas on.
You don't have a lot of riding time under your belt if what you say is true and it will come in time if you don't go too crazy and hurt yourself again :silly: