At this time of the year I can't wait to get started. Sowing different tomato varieties and seeing them germinate is one of the great pleasures of the season.
Most seasons I sow too early and end up with lots of plants that are unable to go outside overnight, because of the frost, and the house becomes crowded with tomato plants!
My plan this season is to sow a few bush varieties that can cope with lower light conditions without becoming too leggy - remembering that they need space as they grow and potted up into bigger pots. I tried this idea last season and it worked fine with Glacier - a variety that can cope with low temperatures and will grow as a bush or tall type.
The variety I recommend for this is Tumbling Tom. It comes in red and yellow types, doesn't get leggy and produces a good size cherry that tastes great.
Normally the sowing time for outdoor growing is around two months befroe the last frost date in your area.
However, it is possible to sow three months before the last frost date if you sow a bush variety like Tumbling Tom, keep them in as much light as possible and away from damp, cold conditions (inside of course) and don't over water them.
It's great to have your own tomatoes early in the season and there are ways to etend the growing season at the other end too!