“If you have come to help me, you are wasting your time; but if you are here because your liberation is bound up with mine, then let us work together.”
Aboriginal activists group, Queensland, 1970s, see: Lilla Watson

Lynn Gehl's "Ally Bill of Responsibilities" contains 16 points.  Here are the first two.  You can read the complete Bill here.  
"1. Do not act out of guilt, but rather out of a genuine interest in challenging the 
larger oppressive power structures; 

2. Understand that they are secondary to the Indigenous people that they are 
working with and that they seek to serve. They and their needs must take a 
back seat"  

Allyship - The Anti-Oppression Network
includes sections on the roles and responsibilities of allies​
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“How can I help” answered concretely - âpihtawikosisân (Chelsea Vowel)

So You Call Yourself an Ally: 10 Things All ‘Allies’ Need to Know - Jamie Utt

Accomplices NOT Allies: Abolising the Ally Industrial Complex - Indigenous Action Media

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Related Resources

Allyship & Solidarity Guidelines - Unsettling America
a collection of statements, guidelines, tips and principles for allyship and solidarity work that centres Indigenous peoples and is focused on radical change

Dear Ally, Solidarity, Reconciliation Worker - by Lynn Gehl

11 Things White People Can Do to Be Real Anti-Racist Allies - Kali Holloway

From Truth Telling to Land Return: 4 Ways White People Can Work for Indigenous Justice by Jamie Utt

CBC Radio's Unreserved - episode on allies [short articles and audio of the interviews]
Aired February 7, 2016.  Featured interviews with David Suzuki, John Ralston Saul, groundworkforchange.org co-founder Monique Woroniak and anti-racist educators Elizabeth Gouthro and Verna St. Denis.