*Add a balanced plant fertilizer diluted to half strength. I use a half-strength solution of fish or kelp emulsion.
Let them grow now, and every once in a while I run my hand over the tops of them like the wind is blowing, this will make them strong and stocky, my husband taught me this trick or you can run a fan back and forth on them.
When they are about 6-8 weeks old you can transplant them if your pots are too small or its getting crowded in the containers. I still use some of the soiless mix and some of my own dirt mixed in. Gets em use to my garden dirt plus my dirt has all the nice nutrients and such! Again remember to make sure the soil/dirt is damp before you transplant.
Hint: use the eraser end of a pencil to poke a hole in the dirt then just set the seedling in! Makes it much easier!
When they have 2-3 true grown-up leaves its time to 'Harden' them off!
That means getting the seedlings use to the outdoors. What I do is start about 2 weeks before I want to plant them outdoors.
I put all the seedlings on trays to make it easier for me tom carry, and set them out side for about an hour to start the first day, then 2, then 3 etc. Be sure to keep them out of the wind for those first days. At the end of those 1 or 2 weeks they are ready to add to your garden!!
Also remember before planting outside or even hardening off wait for the last frost. When the frost days are over start planting.
Another good idea is to plant on an overcast day, much better than a sunny day.
Another hint is when taking the seedlings out of the container grab by the leaves, gently. You do not want to break anything!
I keep a notebook of all I do in the garden, what works and don't work. I put pictures in the notebook, ideas, wants for the garden etc.
I put all my printouts in the book.
Seed starting chart- http://www.organicgardening.com/learn-and-grow/seed-starting-chart
Growing zone: http://www.aroid.org/horticulture/zonemap/
Soil mixes- http://www.scribd.com/doc/2149325/Seed-Starting-Soil-Mixes
Seed starting PDF- http://www.uaf.edu/ces/publications-db/catalog/anr/HGA-00032.pdf