New to herb gardening

New to herb gardening

Hi guys. First of all, I have a bunch of basil, cilantro, rosemary, thyme, and sage currently. What I need help with is: How do I harvest them each when they are ready (how do I know when they are ready even???) or when I want to use some of the herb? I am afraid I am going to pull something off and hurt one and possibly kill it. For example, the thyme looks as if it's ready to be harvested. There's SOOOO much of it. I don't even know where to begin. Do I just pull some of the leaves off or do I take stems off? How do I harvest the other herbs? Thanks a lot!
my loft’s living room

my loft’s living room

more pics

more pics

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Where to buy Lycopodium clavatum for terrarium? Retailers of less common ferns and fern allies?

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Grapefruit?

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A Garden of My Own

A Garden of My Own