You can use a vermiculite, peat moss or perlite; but, at this point garden soil is too heavy for seeds to germinate in.
Start seedlings using warming mats and/or grow lights for best germination rates.
Seedlings to start Mid-March:
You will want to read the seed packets carefully. You will want to be able to harden (if necessary and) replant seedlings outdoors 10 weeks after germination. Using a calendar and calculating your start date is the best way I've found.
You can Google your zone here: Google Search for Growing Zones
|This Map shows the Hardiness Zones for the U.S. For practical purposes most of Maine is considered to be Zones 4 to 5.|