Put a tooth pick in Avocado seem and suspend upside down in a glass of water. Make sure the glass gets direct sunlight. The roots will start to appear in 2-6 weeks. When the roots are thick then plant it in the rich soil.
Avocado trees usually requires water 2-3 times per week. Put mulch around the trees to make sure that the moisture stays inside the soil. Nitrogen rich fertilizers can also be applied to the tree in batches of 1/2 – 1 pound.