I started growing avocados from a pit above water as well! I started planting them straight into a pot a while later and now I'm planting them straight into the ground! These seeds have a particular trick than involves "finding two halfs for each one and leaving a sort of not buried more than half of the bottom of the avocado pit and not leaving the top half too much above the soil".
I always get to see the seedling growth and I know by its "greeness" and different vibrant colors how well is doing so.