The same way you crafted Air Runes, the mind altar is located west of Ice Mountain near the edge of the Wilderness, and is east of the Goblin Village. You may unlock the music Miracle Dance here. The closest bank is in Edgeville, but that path crosses the Wilderness which should not become a problem if you travel along the Wilderness ditch. The second closest bank is in Falador.
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A mind tiara is a mind talisman that you wear. If you do not know what a mind talisman is, Well than a mind tiara is used for making mind runes, it helps you find the mind runecrafting place and you need a mind tiara/talisman to craft mind runes!
There is no special soul altar. From runescape.wikia.com: "The Ourania rune altar allows runecrafters to craft a random selection of runes, including the soul rune." So, if you go to the Ourania altar, you will craft random runes, including soul runes now and then.
crafting runes at alters. Use runes ess at certain alter to craft those runes. Eg water alter you crft water runes.
You can buy it at ge or you can do the quest calles rune mysteries so you can actually craft runes.
earth or fire cause they are very close to banks