This gets asked quite a bit. Honestly, there isn't a "right" or "wrong" way to order a chain. What really matters is whether the effects order works for what you need. Try different orders, see what works for you.
There's only 6 different ways to try, test them all out for a day or two each trying different settings to see what you like.
Code:
Octave -> Envelope -> Fuzz
Octave -> Fuzz -> Envelope
Fuzz -> Octave -> Envelope
Fuzz -> Envelope -> Octave
Envelope -> Octave -> Fuzz
Envelope -> Fuzz -> Octave