StraitSynthetic

This should be determined by the size of the pot you choose, but if you plant too thickly, you can always thin your herbs out after they begin to sprout.

Also, keep in mind, herbs do best at temperatures between 65 and 70 degrees F, but are adaptable to the somewhat lower temps at night. Protect them from drafts but give them good air circulation by allowing some space between plants.
Overwatering ruins a potted herb, so let the soil surface dry out before each thorough watering (until water exits the bottom of the pot).
If you see the beginnings of an insect infestation, a good shower in the sink or tub and a foliar spray, I like to use 1⁄2 ounce AGGRAND 0-0-8 Kelp and Sulfate of Potash and 1 ounce of AGGRAND 4-3-3 Fertilizer mixed together in a gallon of water to give plants a boost. This also works well as a monthly soil treatment.

Here is a list of common herbs and the type of conditions they prefer.

Basil: Regularly snip sprigs to keep from flowering. Will produce until it becomes woody. Use clippings to root new plants.

Chives: Cut foliage as needed. Fertilize after
completely cut.

Mint: Likes cool humidity. Does well in a wide, shallow pot.

Oregano: Likes it dry and well drained. Keep it trimmed regularly.

Rosemary: Likes humidity and well-drained soil. Don’t let it get too dry

Sage: Can be allowed to dry out. Clip regularly.

Thyme: Doesn’t need as much sun. Trim regularly.

Good luck.