First, any major difference between the position on a dedicated TT bike VS clip-ons ? aka time savings.
Yes, there is a difference, but most of the aerodynamics of the bike are actually the rider. Get yourself into an aero position, and you will be faster, whether a road bike or a TT rig.
second, any TT clip ons that I should look at more then others ? How long does it take to install them ?
This tends to be a personal preference. Some riders prefer the "S" bend style, whereas others prefer the "L" style. I personally prefer the "S" bend, but since you are just buying a set of bars, this would be a perfect time to experiment. Don't get an expensive set, just get a set to experiment with, and save up money to buy the better bars when/if you do go for a TT bike.
I'm thinking of going the clip on route for this season or at least when I'm fully decided about TT and or find a great deal.
A good idea. I went full-bore into my TT bike, having never ridden one. It was a bit crazy, but I said "what the hell", and get a very good price. If you haven't found a good price, shop around, but definitely try TT's out. Personally, I don't like pack racing. There's something about crashing, or the risk of crashing, that isn't my style. TT's are just you versus the clock.
Hope this helps.