Kia ora Terina,
It also depends a little bit about the definition around “business plan” – I’m with Andy in that there’s no need to write a detailed, wordy business plan. I do think it’s important to capture some basics though… Michelle’s framework could tease this out – and there’s also tools like “lean canvas” (Google it) that can be useful.
What is important is having a financial model – ideally a 5-year big picture financial plan (profit/loss and cashflow). It makes you really think about how you’re going to build this business in terms of sales (income) and what it’ll take in terms of resourcing (expenses).
I’m a visual and analytical type (and a bit dyslexic) – so a combo of the 5-yr financial and a lean canvas captures it all.
I hope this helps. Kia kaha! kia manawa tītī!