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You take a sickle mold and bring a silver bar and use them on furnace.
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
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.
To craft a simple gold ring, you need to buy a ring mould and a gold bar. You use the ring mould or gold bar on the furnace, and that should be it. Make sure you have the right crafting level! Hope this helps =)