Let's see...
I wouldn't worry about rings just yet. Usually, rings start stuck (low compression) then free up as you run it (compression comes up). I"m assuming you dumped some oil down each spark plug hole and re-did the compression test for each, with no change? That would mean your rings are probably good.
If the cam chain slipped, you'll definitely have to re-set it before you do any kind of compression testing or engine movement. Otherwise you're looking at bent valves, or worse. Take the intake cam (rear) off, then re-set the cam timing as stated in the manual (I can get details if you need them).
To take the head off, you'll have to remove the upper radiator hose connector (two allen bolts), the carbs (done) and exhaust (not all the way- just drop them down out of the way). In addition to the main cap nuts, there are four small bolts on the backside of the engine- don't forget them!
Valve clearances can be checked with the head off, and is slightly easier than with the motor in the bike. You'll just have to prop the head up off your workbench a little, though- the valves protrude beyond the bottom of the head. The guy who helped set my valve clearances took a couple of 2x4 and screwed them to the edges of the head, using the outer two stud holes with a set of screws and large washers. Just be sure you don't lose any buckets or shims as you're taking the cams on and off. If they do come out, make sure they all go back in the same place they came out of.
A good machine shop should be able to do a valve job, at least re-seating all of them. This will change your valve clearances, so be prepared to learn how to adjust those. Before you take the head in, however, flip it over on your workbench and fill each cylinder top with fuel. If any leaks out, you have a bad valve.
While you have the head off, do yourself a favor and get a new set of valve stem seals. I bought the ones I needed, and the machine shop I took my head to put the on while they had the valves out. Now's the best time to do so.
The best advice I can give is to get comfy with the Service Manual. It does a good job of laying out each step needed to take the head off, and the correct way to put it back together. Before you do anything, read up on it first so you know what to expect. It is, bar none, the best resource you can have for any kind of work on this bike.
Best of luck!