On the topic of finding bevel angles: this way is the most fun.
There is the paper technique (fold a square into a triangle gets you 45 degrees, half again is 22.5), estimating half a thumb when pressing a thumb against the spine, buying plastic angle guides that rest on the stone (search Amazon), a useless stack of nickels trick, or you can just pick a random angle.
I have a theory though, based on the premise that you want the thinnest useable angle without the edge folding. It's crude, but this approach lets the knife tell you which angle is best. Instead of you telling the knife.
TLDR version
Do this at a low angle
Notice where the edge folds. Then do it again with a high grit stone (1000-10,000-grit +) at a slightly higher angle.
If you want the breakdown, here are the steps
1. Pick the lowest angle you're comfortable with. Usually I aim for a 1/4 inch grind at the edge of the knife. The angle will depend on the grind and thickness of the knife.
2. Once you're sure you're only going to be rubbing that last 1/4 inch edge of the knife, hone until you get a burr. A low grit ~400-grit stone is ideal.
3. Repeat on the opposite side, until you get a burr again.
Congratulations! You can now gently strop the burr away on denim with CrOx and you're done the first phase. Test with paper or arm hair as you strop.
Now, use the knife as you will. Try to avoid hitting tile/rock/stone/granite. Just use a cutting board with food and be careful in the bush.
The edge WILL fold for sure. At least in some parts of the knife. Now you're ready for phase 2.
4. Note where and how severe the folding is.
5. sharpen on a high grit slightly steeper then last time. Focus either in the problem areas or the whole knife. The grit just depends on how severe the edge folded and how much time you want to spend tuning your new edge.
If you want convex, just rock the blade between your old and new arbitrary angles as you do the phase 2 resharpen.
*Note*You could use a denim/CrOx strop down to a 1000-grit stone. Just don't go below 1000 for phase 2.
You've now created a secondary bevel that will hopefully not fold. If it does, rinse and repeat phase 2.
Eventually, you will have the ideal angle specific to your knife, it's steel and your usage.
Personally, I've had success with one to two passes through phase 2.
Here's some pictures of the result on my master Hunter with DLC.
http://vault.sfu.ca/index.php/s/BKw1rOULOuNRCm7
http://vault.sfu.ca/index.php/s/gSzKH4wjnVjGbjr
The tip to get a sense of how steep the angle is vs. The grind, keeping in mind this is the 3V for context.
http://vault.sfu.ca/index.php/s/p2fPj9auR5DrNHo
http://vault.sfu.ca/index.php/s/2QH5Z56dzrd9UMJ
Not flawless execution on my part, but it works. And now it slices like a mofo towards the tip and hacks like a champ at the heel.
Oddly enough, the thicker part seems to prefer a steeper angle (closer to 20 degrees) where the tip likes more of the 10-15 degree range.