Hey deepblue, all these questions!
OK, I'll try to answer a few.
Jetstream and other weather related stuff - look at the "Resources" item on the menu on the left of this page. You'll find useful jetstream maps and a cloud prediction site.
Screws at the primary mirror end of the scope - should be described in your user manual? However, I expect you have three big ones and three smaller ones. The three big ones are the ones you use to adjust your primary mirror tilt (that's their main purpose). The three smaller ones are to "lock" the mirror during transport - you screw them in until the just touch down. In use, you wind them back out a turn or two. Then the tilt adjustm,ent can be done with the three big screws. It's normally suggested that you should only have to adjust two of these - the third can be left wherever it is.
Have a good look at the collimating video on
www.andysshotglass.com But note that when he has his hands on the knobs, he is touching one of the "lock" screws, not one of the larger tilt screws.
Happy viewing
