Helm Lardar:"Secondly, you appear to have some strange goals for a non-member." Anyone who is confused with Shree Sairam's aims: the stats wanted are virtually Salmoneus' stats. That is why at first glance they seem so perplexing. To Shree Sairam: If you would like to earn money in Runescape, everything you want to comprehend how to make money with skills (fishing, mining, woodcutting) and also to understand that there are money-losing skills (cooking, smithing).
You said you want to create and market mithril collections (6,223 gp) to buy a Santa Hat (100.6 million). But smithing is a money-losing skill. A mithril set requires 13 mithril bars. 13 mithril bars * 1680 gp per mithril bar = 21,840 gp 6,223 gp. Selling mithril bars, mithril ores, or coal are better money-making than purchasing mithril complete collections.
Stronger profitable from the Grand Exchange comes from purchasing raw material (raw fish, ore, coal, bars) since many people wish to buy raw stuff to quickly level up their skills (they know that they will lose money but profit fast capacities XP). It is possible to market 100.6 million gp of mithril bars to buy a Santa Hat, but by selling mithril full sets to the Grand Exchange to purchase a Santa Hat, you would have needed 353.1 million gp of mithril bars to create 100.6 million gp of mithril total sets (a colossal money-losing proposition).
While smithing will make you money should you use it to smelt metal pubs, smithing loses you money if you apply the skill for hammer and anvil metal processing. It's not by inherently having level 74 smithing (like Salmoneus) that you are able to find a Santa Hat.
And as much as needing level 60 cooking (Salmoneus' cooking level). People who do not want to fish but who wish to quickly raise their cooking level will knowingly lose money buy buying raw fish, cooking the fish to receive fast cooking XP, and also selling the cooked (less gp) fish back to the Grand Exchange.
A good thing to do would be to fish, sell raws to the Grand Exchange. Keep you cooking level . And if you require food to train your battle , fish, sell the uncooked fish into the Grand Exchange and purchase cooked fish. You have the cooked fish to eat and in precisely the same time wind up with more money should you do it that way. Again, if you would like a Santa Hat, a much better idea is to keep your cooking level , and promote raws. Cooking just loses money. Another person who published suggested runecrafting for good money. But don't bother with this, runecrafting is a completely useless ability. There are far better ways to earn money than runecrafting.