Smelting bars are tied to Mining, you don't need to mine ore for yourself - requirements for efficient smelting bar are sufficient to stop a lot of people from doing it and it's a good idea to purchase a large amount of raw material from the Grand Exchange , smelt it and then send it back to you as a refined goods.
Essential items and skills are as follows - access to furnaces coal for higher-level ores (and a hard to obtain coal bag) and 15 30, 50 70, and 85 Smithing skills for bars as listed below. Adamantite, steel, Mithril and Runite Ores will require 2, 4, 6, or 8 coal nuggets each 1 nugget ore in order to properly smelt it. Smelting iron bar iron has the potential to fail, and you need to avoid losing your equipment Ring of Forging.
The tablet can be created by acquiring a mahogany a demon's lectern that is in the Study, unlocked Bones to Peaches spell Mud Battlestaff as well as two Nature Runes and one noted soft clay. Mud Battlestaff can be substituted by Earth and water Runes (four one of them).
If you can afford it Hire a Butler or Demon butler to reduce duration needed to fetch materials. Other requirements include 60 Magic skill level as well as the level 67 of Construction. Once you've got all the materials , you can change the location of your home in Rimmington and then head to Phials yourself to un-note the tablets (by making them available to him and then selecting the third dialogue option) or send your Butler.