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You can start pinching once they have a few sets of true leaves. You may want to wait until it is 6" high (or wide) or so, just to make sure it is well established.

You're not too late for toms if you get plant from a garden centre. Also july is the time for beans, main crop carrots and, beetroot.

We won't give you the answer (because school is for a reason) but we would recommend looking at US food chains and carbon footprints for the answer.

For most herbs, yes, you can dry them at the same time. There are a few, however (rosemary or mint), where they are just too strong and should be done separately.

We are glad to hear that you decided to grow your own herbs and that our information helped you with that. It is our goal to make gardening easy for everyone. :)

As an answer to your question on freezing herbs, yes, you can freeze them. It is an excellent way to keep herbs. This article will help you with that: https://www.gardeningknowhow.com/edible/herbs/hgen/freezing-herbs.htm

This site may be helpful:
http://bonnieplants.com/our-story/the-greener-grower/