The earlier in the chain the better.
Depends...
If you wah is not buffered to work in front of a wah it simply won't work well when the tweak fuzz is on but if you're just woried about using the fuzz alone if it's placed after the wah you should be fine...
Dealing with fuzzes can be tricky...I always suggest having them as early in the chain as possible mostly because thats the easy answer...
FWIW, I run my fuzzes after a wah (non true bypass), an Octavia (true bypass) and a Vuni Vibe (also true bypass) and get great results but my board took a lot of planning to work well with the fuzz not placed first because thats what gave me the sound I wanted...
Just try it and see...if you like it then it works.
Either before or after the wah, depending on how your fuzz interacts with your wah, and which sound you like better.
Boost into fuzz can be fun as well, but people generally seem to prefer boost after fuzz, for smoother and more varied tones.
Definitely before time domain effects, though. Distortion after those tends to just muddy things up.