Not difficult. I start them indoors in Feb/Mar. Cover with plastic or glass until they have germinated. Keep at 70F-80F until germination, then drop the temperature a little. They need bright light, direct sun if you can get it, or bright fluorescents almost touching the plants. If your light is poor then keep the temperature cool, especially at night, to avoid stretching. Most modern hybrids will grow best with dilute fertiliser from an early age, depending on how rich your seed starting soil is.

I don't know where you are, thus don't know your zone or last frost date. But it's an important factor. Petunias should be started 8 to 10 weeks before your last frost. They can handle cooler temps and though my last frost is around the third week in May, I have planted them in a protected area in early May or late April. Thus, I usually start them in late February. If you are in a warmer climate then the northeast, get on to it, now. Only thing not mentioned so far is that they need light to germinate. When starting them, don't cover them with soil. The seeds are tiny. Make sure they're pressed onto the soil, are evenly moist and cover the container with something clear and place the container in a lighted area. They don't need light 24 hours a day, but the usual 14 to 16 hours a day as is the case with most seedlings. Once they're up, remove the cover and grow as for other seedlings. Once they have a few leaves, they like cooler environs, 60 to 65 degrees and can be pruned carefully to become bushy.

Thanks for the great info - I appreciate the time you took to clear things up for me!

hello;
some additional cultural notes from Pan American Seed pertaining to the "Wave Series" >> plug and liner production(starting from seed)
http://www.panamseed.com/PAS/pas_gfacts_page.htm

Here is a link that might be useful: PAS wave cultural notes