Usually when I write a story, I start with a map. It's a trope that I started after reading David Edding's The Rivan Codex, where he says to always start that way. With The Witch's Human, I started with a concept. I thought about the tropes surrounding witches and familiars and wondered what would it be like if a witch summoned a human from our world as her familiar. I knew she was still going to school, and summoning a human would be a big deal. So I started writing with Rae summoning Jalen, and the fallout of that momentous occasion. The rest of the series continued on from that opening idea.
Writing The Witch's Human is a three step process. I write the rough draft by hand in a notebook, as I find my creativity flows much better through pen than typing. Along the way, I'll place sticky notes in the text identifying areas I might want to expand upon, edits that are necessary, and places to put plot hooks when I come up with a twist later on.
I then type the second draft. This is usually word for word, but I'll tweak my text as I get the inspiration. This is also where I make the edits from my sticky notes, and lay other clues now that I know where the story is going.
Once I've completed my second draft, I send the story to my beta readers. They let me know their thoughts and I revise my story based on their feedback. I want to mention that the beta readers don't tell me what to change, rather tell me their thoughts and impressions. Once I've completed any changes, I do a final lookover to make sure I didn't miss any grammar and spelling mistakes.