Hi Genya,

You should find these sites helpful.

Flowers - perennials and annuals
http://www.muextension.missouri.edu/...ort/g06570.htm
http://theseedsite.co.uk/
http://www.savvygardener.com/Feature..._calendar.html
http://www.chestnut-sw.com/seedhp.htm
http://faq.gardenweb.com/faq/wtrsow/
http://forums2.gardenweb.com/forums/wtrsow/

Veggie info:
http://nctomatoman.topcities.com/Off...g/OTV4SEED.htm
http://tomclothier.hort.net/page11.html
http://www.savvygardener.com/Feature..._calendar.html
http://www.gardenersnet.com/veggies.htm
http://www.explore.cornell.edu/scene...0a%20Vegetable
http://www.savvygardener.com/Feature...egetables.html

That should get you started. Don't hesitate to ask more questions.

Do keep in mind that paying attention to the soil (when planting in the garden) is most important. Healthy soil that has been amended with compost will give you healthier plants that will be better able to withstand stress, pests and diseases.

Knowing your hardiness zone will be helpful.
http://www.gardenweb.com/zones/zip.cgi

Newt