Here's a breakdown:
* ah (as in "father")
* nish (as in "fish")
* in (as in "sin")
* ah (as in "father")
* bek (as in "beck")
It's important to note that the "a" in "Anishinaabek" is pronounced with a short, sharp sound, like the "a" in "cat." Also, the "k" at the end is pronounced, unlike in some English words.
If you're unsure, you can always ask an Anishinaabe person for help with the pronunciation.