Welcome to gg from another zone 6er. Coleus are easy to start from seed. Surface sow on a sunny windowsill, or under a florescent light. They do grow in window sun, but I eventually put them under a florescent light so they wouldn't get leggy. I started mine about 3 months ago and they are, to me, still quite small-- 3-4 sets of true leaves and only about an inch and a half wide. They are starting to develop color. I have been pinching off the bottom sets of leaves so that the energy can go into the better leaves and make a compact bushy plant. They are very cold tender, so as a fellow zone 6er, I would say definitely wait at least until May before you put them outside permanentely. I have read that they are fairly easy to root from cuttings, so if you have one that you particularly like, you may be able to clone it/extend its life by starting a new one from a cutting. If you don't want to save the seeds, cutting the flower stalks can maintain the vibrancy of the plant longer than if you let it flower. Even though they are annuals, I have read that their life-cycle can sometimes last for longer than one year if brought in for the winter, so they make a good houseplant. So, that's what I know about Coleus.