Question 1: You can make essential oils. The plants do that. What you have to do is extract them, and you'll need quite expensive equipment to do so - not to mention LOTS of the herb! However, there's a fun experiment you can try at home. First, gather up enough leaves to cram into a saucepan, add some water, put on a lid, bring the water to the boil. Reduce the heat, and simmer for maybe 20-30 minutes or so, or until when you lift the lid you can see tiny droplets of oil floating on top of the water. This is the oil you're after. Syphon it off carefully, or skim off with a spoon, trying not to take up any water as you do so. You'll need to work fairly quickly, because the heat makes the oil evaporate. If you get a teaspoonful, you'll be doing very well indeed. It won't be pure essential oil, because it's inevitable that you've contaminated it with water, but it's the right stuff, nevertheless.

Question 2: I know nothing about fishing, but suspect that any herbs that would help you catch fish would be poisonous - would kill or stun the fish, making them easy to catch. Sorry, this is a job for internet-searchers!

The link below gives some information about using Artemisia (probably wormwood, although there are lots of different Artemisia species, including southernwood, mugwort, French Tarragon to name a few) - but not much!

Question 3: I know that a tea made from the leaves or wormwood can be used externally as a wash to treat wounds, ulcers, insect bites and skin problems (unspecified). Since you haven't said what condition needs to be remedied, I can't say whether wormwood might help or not. As far as I know, it isn't antifungal, so won't treat tinea, if that is the problem. There must be 1001 different things that can go wrong with the feet, so you need a proper diagnosis before any treatment can be suggested.

Here is a link that might be useful: search result for 'artemisia foot remedy'

Daisy, I think what Yvette's BF has in mind is to attract fish, not poison them. When I was a kid, I fished with my brothers and some of the lures and baits smelled like licorice(or anise)to me, so it may be a scent that fish are attracted to. Just my thoughts.

Fish like corn too... maybe there is a special odor there too.