What's your question? Ask

The tea mixture sound good. Ecoli and salmonella is a remote possibility, but if you are concerned, boiling it will kill any germs.

Here are a few articles that will help start the garden:
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-gardening-advice.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/amending-sandy-soil.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm

As for using the goat manure, that sounds great and will help the soil considerably. You may want to compost it before you spread it to reduce the smell, but other than the smell, you can use it directly.

There is no real health issue, but your seeds will not grow well. Raw chicken manure is extremely high in nitrogen and will burn the seedlings. You need to compost it before putting it somewhere you what to plant seeds. This article will help: https://www.gardeningknowhow.com/composting/manures/chicken-manure-fertilizer.htm

Manure is a green compost, so you need browns (like leaves) to offset it.

This article will help you:
https://www.gardeningknowhow.com/composting/manures/chicken-manure-fertilizer.htm

Using fresh manure or compost can burn plant roots. There are numerous recipes for making both manure tea and compost tea--far too many to list. Provided the manure or compost has aged somewhat prior to its use, there is no harm in experimenting with different ingredients in order to find one that works for your specific gardening needs.

Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/composting/manures/manure-tea.htm
https://www.gardeningknowhow.com/composting/basics/compost-tea.htm