Try your hand at growing Dill sometime. It is very rewarding.
The seeds take about 7-10 days to germinate. You will want to plant them about 1/4 inch deep in soil, and spaced about 1 inch apart. They grow to be about 2-3 feet tall. The days until you can harvest dill is about 65-70.
Sow the seeds in average soil, after the danger of frost is past for your area. You can thin out the seedlings when they are about 2-3 inches tall, if you like. The final spacing can be about 8 inches apart, to grow the best.
The best time to harvest, is when the flower heads are still abundant and green. You can cut the entire plant to dry, and hand it upside down and in a paper bag. For me, using rubber bands helps make this process easier.