To start a garden, choose a sunny location with good soil. Clear the area of weeds and debris, then loosen the soil using a shovel or tiller. Select plants that suit your climate and space, and arrange them according to their sunlight and water needs. Next, plant your seeds or seedlings at the appropriate depth, following the instructions on the seed packets or plant tags. Water the plants regularly, ensuring they receive enough moisture without becoming waterlogged. Mulch around the plants to retain moisture and suppress weeds, and monitor for pests or diseases to keep your garden healthy.