Answer: The avocado is a tree and if left alone will grow straight up and not make a very attractive plant. Help it out by clipping off the top two inches just above a set of leaves. This will allow it to send out side branches. As it grows prune it to shape whenever it starts to get out of hand.
Transplant it as it grows bigger. An easy rule of thumb is not to let it get higher than five times the diameter of the pot. Remember to feed it regular houseplant food if it's in commercial potting soil and if you plan on it feeding you it will be a while. It takes seven years for the avocado to mature, and unless conditions are just right, it's not likely to produce fruit. You will however have a very nice bushy houseplant.
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