Thanks for writing. Spindly seedlings are often a sign that they need more light. If you're using fluorescent bulbs, keep them 6-8 inches above your seedlings; if you're growing them in a window, be sure to use the largest, brightest window you have.
Get more tips for starting seeds here! http://www.bhg.com/gardening/yard/garden-care/seed-starting-essentials/
---Justin, Senior Garden Editor, BHG.com