You could start by doing a college course like:
- Level 2 Certificate in Countryside and Environment
- Level 3 Diploma in Countryside Management
You can find colleges offering relevant courses through the National Gamekeepers' Organisation Educational Trust.
You may need:
- 2 or more GCSEs at grades 9 to 3 (A* to D) for a level 2 course
- 4 or 5 GCSEs at grades 9 to 4 (A* to C) for a level 3 course