Planting seed outside: In the fall plant the pits about 3 inches deep. A successful gardener can advise you here. Mark where you put it so that you can watch for the sprout coming out of the soil in late spring. This system generally works if you live in the northern 2/3s of the United States where the soil temperatures get cold enough. Plant as many as you can of different varieties to increase your chance of getting a seed that will germinate. The orientation of the pit is not important--the roots and the sprouting top will sense the right way to grow. Ground squirrels have been known to tunnel and eat the seeds just as they start to send out roots, so be on guard.
Planting seed indoors: Yes, you can plant pits directly in soil in your house.Good quality soil is important--a good balance of sand, silt & organic matter. The soil should be firm around the pit. The soil should be slightly moist to the touch. If you squeeze the soil in your hand and water drips out, it is too wet (unless you just watered). Again, the typical amount for good growth as a seasoned gardener can advise you. If the soil is saturated with water continuously, the pit tends to rot.
A better approach to planting seed is to clean and dry the seed, store the seed until December and use a cold treatment to induce the seed to germinate. The method is as follows.