Take a course in landscape architecture. Or if that's what this is about, do your own homework.
1. What you will plant.
A. How much sun is needed by each plant and how big it will get or vine out.
2. Write down each plants characteristics and note if it has any special needs.
D. Dept of planting seed or plant.
E. Watering needs.
F. Likely pests and what you should do about them.
3. The soil. How it needs to be worked, fertilizd and readied before planting.
A. Also know the length of your growing season.
4. In the case of seeds, know weeds from the actual plant once they sprout..