Welcome. I'm sure you'll get some of the more experienced people giving answers later, but I'll hit on what I can answer now.
First, I'd check out the H16 assembly manual. The pictures are a little dated, but they still get the point across.
http://static.hobiecat.com/2010_archive/support/pdfs/H16_Manual.pdf
Page 18 shows how to rig the main traveler. That should answer question 1 and 2. You control the main and the traveler with opposite ends of the loop between the main blocks and the swivel cleat in the middle of the rear crossbar.
When tacking/gybing, you have to swing the tiller around the stern of the boat. With practice it gets pretty easy and will hardly take any time at all.
As far as the cams go, there is a tensioner screw underneath the little ball. If you take the rudders off of the lower rudder casting you will see it. The problem is that sometimes those tensioner screws (which are nylon or plastic) won't move. I was able to back one of mine out just enough to get the cam to flip properly, but there was too much gunk in there to actually remove it and replace the screw. There are more detailed fixes for this if you can't move the screw at all.
It sounds like you've got the older style jib halyard. I'll answer what I think you're asking here. The shackle on the top of the halyard should stay at the bottom of the mast when not in use. Then you can shackle it to the jib, attach the little plastic hank to the forestay, and raise it up. The end of the wire that's closest to the mast should have a little block attached to it with a piece of line tied to a becket on that block. You shouldn't need to be tall to deal with it. Page 19 of the assembly manual covers rigging the jib.
Also, an answer to a question you didn't ask. If you've got the old 5:1 mainsheet blocks (seaway brand) you rig those as shown in the picture on page 25 of the manual. That picture is a relic that I'm glad was never removed.
Hope that helps some.
-Jeff