Parsley is easy to grow from seed, but I find that my very best parsley
grows when it reseeds itself.
However, to start it on your own prep the bed, broadcast the seed, and
scratch it in. Then just make sure you keep the top inch of soil from
drying out until the parsley is about 3" high, then you can start
tapering off to a normal watering schedule.
Be sure to let some of your plants go to seed and you'll never have to
plant it again.
Eliza