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Add about 2 lbs seaweed (kelp) to a 5-gallon bucket of warm water (approx. 2 gallons) and stir it well. Some people also add fish emulsion too. Allow this to 'rot' by putting a lid on the bucket and letting the mixture sit for about a month or so, stirring it every few days. When it's ready, the mix will become murky and brown. Prior to use it must be diluted, so you will need to add more water at a ratio of 1:16 (8 oz per gallon). Once diluted, you can pour the mix into a spray bottle and apply to your plants.

If you want to add the kelp seaweed to your compost, simply rinse it off (to remove any salt build up) and mix it into the compost heap, especially with your browns like leaves or straw. There is really no set amount to put in the compost but make sure that you are using an equal mix of greens (which would be seaweed, grass clippings, food scraps, manure, etc.) and browns (leaves, straw, newspaper, sawdust, etc.).

Maggots are not going to hurt your compost; in fact, they are quite useful in breaking things down. They may, however, be a sign that your balance of green to brown materials/ is off. Make sure that you are adding enough (but not too much) browns, like straw or shredded leaves. Also, it may be too moist. If it is too wet or has too much green material (kitchen scraps, grass clippings, etc.) in relation to brown, it can attract lots of maggots. This article will help with balancing your browns and greens: https://www.gardeningknowhow.com/composting/ingredients/browns-greens-compost.htm

This article should help: https://www.gardeningknowhow.com/composting/basics/starting-compost-pile.htm

Here is additional help with composting, depending on your needs: https://www.gardeningknowhow.com/composting/

Yes, they are great for the soil. Here is more info that should help: https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm

No, it is not recommended that any fats or oils be placed in compost. This article may help with what you can and cannot put in compost: https://www.gardeningknowhow.com/composting/ingredients/what-can-you-compost.htm

The manure tea needs to be diluted. Leaving the manure in it can result in too much nitrogen, which can subsequently result in buring of the plant roots. You can simply toss the bat dung in the compost pile or spread it throughout the garden soil and leave over winter.