I've found growing coriander pretty easy. Just get a plastic pot, about 4 inches is a good size, fill with potting compost and water a bit until its damp but not waterlogged. Then sprinkle a dozen or two seeds on the top and cover with a small amount of compost - only just enough to cover them. Take some clingfilm and put over the pot and leave in a warm place for a few days until the seeds germinate. Then take off the clingfilm and put on a windowsill and water occasionally.
If you start a pot every two weeks you can have a continuous supply all summer long (it grows for me from April/May until late September).