There are two ways to start out your seeds:
1. Perched over a cup of water (like the photo demonstrates)
2. In dirt (which grows faster than the water method)
Toothpicks and jars for the water method
Dirt, gravel, and pots (or the ground)
Step 1: The Seed - Water Planting
If you are using the toothpick method, stick three toothpicks in the side of the seed about halfway down. You want half of the avocado to be under water. Set it on the rim of a glass or jar and fill it up. The "bottom" is the fat end. Easy enough, right? Refill the water as it evaporates and keep the avocados in a bright window or outside. They will begin to sprout anywhere from a few days to several months. One avocado seed took three months to get going, but I've never had a seed not sprout eventually. When roots begin to fill the glass, transplant the whole deal carefully in a pot.