Have you tried the Business Gateway one - fairly simple I think -
https://www.bgateway.com/resources/business-plan-templateBasically
1. keep it simple
2. draft out a description of what you want to do on your smallholding, and what it consists of (Executive Summary)
3. State names of you, partner, family, whoever else will be working on the smallholding, and what assegts you bring to the project (Key Personnel, Skills, Equipment)
4. Draft out headings of what you would like to do (Vision or Mission Statement)
5. Lay out details of any marketing you've done or intend to do (Marketing)
6. Lay out a simple time plan (3 to 5 year Timeline)
7. lay out a simple financial cost and income plan(Financial Projections)
HTH