Start with 🔊 How to use Audacity to Record & Edit Audio (38 min, Kevin Stratvert), then EQ for Dialogue Audio: Make Your Voice Sound Better with an Equalizer (8 min, Curtis Judd). All 328 lessons here are free, from the teachers' own official uploads. You'll need usb audio interface, studio monitor speakers, studio headphones (about $420 of kit). The book to keep beside you: Mixing Secrets for the Small Studio by Mike Senior.