Wulp. First, you'll want to let them wilt (or better yet, dehydrate them). This takes out most of the moisture, giving a longer shelf life and greater strength. I typically use the folk method:
Fill the super clean, preferably sterilized jar of your choice to half, with the dry herbs. Then stir in your oil of choice - a medium or light olive or sweet almond are most commonly used, but you're not limited to those. I often use clean
beef tallow, because it's closest to the natural oils in human skin. If you're trying to go vegan, but still want that higher absorption, macadamia oil is amazing, but it does have a shorter shelf life than the others. Stir gently but thoroughly, to ensure there are no air bubbles, and top it off with more oil, if needed.
There are a few possibilities, for the rest of the process. I use the sous vide, for a long, low-temp, to speed up the infusion process, so instead of weeks, in the sun, it only takes a few hours or a day, at most. Some set it out in the sun. Some do a heated infusion, on the stove, placing a diffuser under the pot, or a steamer or cloth inside the pot, to prevent the jar breaking, the bring the water to a low simmer for 30 - 90 minutes. But, be aware that the higher the heat, the more the oil will degrade, reducing its shelf life. I can set the sous vide at 125 - 135, and hold it steady, until I am satisfied with the depth of color. On the stove top, this is much more difficult, without accidental over heating. And, I'm never ok with waiting weeks and weeks.
The deeper the color you get, the stronger the infusion & (in most cases) the more effective your remedies will be.