While they are still online you can watch some of the Olympics - see
http://www.nbcolympics.com/archery/ and click on "rewind" to watch it. They ask a few questions before they let you, but as long as you give the obvious answer they let you on.
http://www.casttv.com/olympics/archery has direct links to the video and that may be an easier option. They have some really nice closeup shots of the clicker while in use.
Of course, as with all things, do what works for you. You can find top end coaches and competitors that do pretty much anything you want to do. It is more focus on the target and letting your body execute the shot that makes the arrow hit the spot.
Most release immediately upon click, it is obvious that a few of them released when off target from the click (you really shouldn't do that, you should control the shot not the clicker - you should let down and start over again if off the target. However even at that level it is a really hard skill to learn). For most it is too hard to have a completely consistent draw length if you pause, for those of us that shoot 80+ yards (and I do with both my Olympic bow and traditional bow - though outside of practice no clicker on the traditional) it *does* make a difference. As far as TP goes you also have to be careful that your Target Panic doesn't just turn into Clicker Panic, both an immediate release and a pause can easily turn into that.
As far as how much to pull, most have the clicker set so that once you come to full draw you need about 2-3mm (an inch is roughly 25mm) to pull through the click, again you will notice that most of the ones in the videos only have the very very end of the point to pull through. You reach full draw and then (for the standard T form - I don't think anywhere here is asking about using the BEST system)use a push/pull similar to when you stretch your arms. It should be a construction of your back muscles and you should feel your chest expand and your chest muscles stretch. All pull or all push usually results in inconsistencies.
And, lastly, 45lbs is *heavy* for a clicker - I mean *really* heavy. For an amateur Olympic archer 40lbs is usually the max one shoots. Those Olympic archers you see are normally only pulling 50 lbs and they shoot in the neighborhood of 35000 to 45000 arrows a year along with daily weight training. An adult male that regularly shoots should be looking at no more than 36lbs for learning and no more than 42 for actual shooting (and then only to reach longer yardages with an acceptable hold point - either barebow or with sights).
I would also suggest looking at
http://sagittarius.student.utwente.nl/bb/ and doing a search for "clicker" or "clicker control" and you will find all you ever wanted to know about them (and then some). I hesitate to list this as some things there can cause more problems than they help, but
http://www.kslinternationalarchery.com/ has a great deal of information on the topic also. Just be careful on reading form topics as BEST is an entirely different beast than what you are most likely shooting, however the mental end of the game and quite a bit of the things like shot cycle, breathing, etc work no matter the style.