Some plan before they write, and others fly by the seat of their writing pants. Whatever you prefer, you will do yourself a huge favor if you outline during your draft.
How many times have you read a draft and couldn’t fully recall all the details? If you summarize each section or chapter as you write, you’ll have a representation of your novel that you can reference when you go to edit, add, or even rearrange moments.
If you already have an outline, consider this as building on that outline, adding notes like character names, places, etc.
I also find that recording what I wrote is almost like giving a prompt for the next writing session.