Hiya Sarah, welcome to the community! Great to have you with us.
Brilliant shout asking for help getting the ball rolling - we don't have a template as such, but our downloadable business guide contains jargon-free tips and advice on what needs to go into a Business Plan.
If you'd prefer to watch a video, we also take you through this in our video 'Should I Go Self-Employed', which is part of our popular 'Take the Leap' series on Youtube. The bit about business plans kicks in around 2:48.
Hopefully this will be a good start for you, feel free to run any ideas past us here on the Crunch Chorus Community Forum!