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First you must grow a chamomile plant (or purchase one). They normally bloom in spring, at which time you can cut off some blooms and allow them to dry in the sun. These can be stored in an airtight container, like a jar, until ready to use. Then you will take about a tsp. of the dried flowers and boil them in water for a few minutes. Strain into a cup and add sugar to taste.

For additional info, this article should help: https://www.gardeningknowhow.com/edible/herbs/chamomile/making-tea-from-chamomile.htm

I have 2 suggestions. 1. mulch the beds to a depth of at least 3 inches year around. Rake the mulch off to prepare the bed in spring. Weed seeds commonly fly on the wind get dispersed by birds and other animals. If you wait until fall to mulch, it is already too late. Option 2 is to plant a dense cover crop as you harvest. Hopefully it will grow quickly and choke out weed seeds. In early spring, till it under. https://www.gardeningknowhow.com/edible/vegetables/cover-crops/cover-crops-for-weed-control.htm

Yes, this should be possible with no problems. It is very hardy, and will tolerate transplant quite well.

This article will give you more information on their care: https://www.gardeningknowhow.com/edible/herbs/chamomile/growing-chamomile.htm

Good news! You are right on the edge of where they will grow! This article will help you to grow them properly: https://www.gardeningknowhow.com/edible/herbs/chamomile/growing-chamomile.htm

The best time to harvest chamomile is on a dry morning when the flowers are totally open.Make sure to wait until any dew has dried. Here's an article to help: https://www.gardeningknowhow.com/edible/herbs/chamomile/harvesting-chamomile-plants.htm

You probably need to add additional N-P-K fertilizer as the seaweed only provides trace amounts of the macro nutrients. Also your azalea would benefit from fertilizer for acid loving plants. You can search our website for each of your plants and an article should tell you what kind of fertilizer that specific plant needs.

Your pyracantha may have a blight problem. See info below.

https://www.gardeningknowhow.com/edible/fruits/quince/quince-leaves-turning-brown.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/fertilizing-with-seaweed.htm