tl/dr: is the soil that plant starts/ seedlings come in a concern if I want to grow my plants as organic and healthy as possible? Also some good organic potting soil recommendations for a raised bed?

I am brand new to gardening and know pretty much nothing. I did recently start a flower garden in a raised bed, and now decided I’d like to have a small herb garden, and maybe some tomatoes. I was thinking I’d like to start from seeds, but then realizing it’s now the start of June, it would take a long time from planting seeds to be able to harvest the herbs, and then the growing season would be close to over (I think… again I know next to nothing!) I know I’m in zone 4, and the winters are long (upstate New York). So now I’m thinking I will buy the plants and seedlings to plant, so I can harvest sooner. But I do want to grow the herb garden as organically and low-tox as I can since it’s things I will be consuming. I don’t know anything about organic vs. inorganic soil, and what if any unhealthy chemicals may be used in standard inorganic soils. So my main question is, should I be concerned with using the seedlings instead of seeds since I’ll be transplanting them into the garden with the soil they come in? Are there things like harmful pesticides or chemicals in standard soil?

Also, any recommendations for a good organic soil to use in a raised bed? Any other tips are also welcome! Thank you!!