When should I start seeds inside?

Not knowing where in the world you are, you need to find the dates when the last of the frosts are done for the season. If you are state side, you can google last average frost date for zip code............ then look at the seed packages how long do the seeds need before the plants appear? Tomatoes will take about 6 weeks to go from seed to a transplantable. So seed them 6 weeks before the last frost date. If it’s a snowier spring you might have to up pot them from a seed tray to a Dixie cup.

It depends on where you live and what you want to grow. See back of seed packs, look up your zone. Start a few weeks earlier in sunny, warm location.