Below is a non-exhaustive collection of mining resources developed for Ethereum Classic. If you have questions, there is an active Mining channel in the Ethereum Classic Discord. Here is a plentiful Video BIOS Collection by TechPowerUp.
The Proof-of-Work mining algorithm for the Ethereum Classic network is Etchash since 28th of November 2020.
Top 5 Mining Pools by Hashrate at the time of writing.
All the publicly known ETC mining pools