Ok, So I have a couple methods for easy Runescape money making in F2p for noobs.
Items: 1000 jugs of water, 1000 clay
Process: Buy as many jugs of water as you want from the gnome at the gnome copters. (that is right between Lumbridge and Draynor village, a bit north off the path.) Then, go to the grand exchange buy as much clay as you have jugs of water for as low as you can get it. Then, make it into soft clay by mixing the clay and water together. Then, sell for a 70 Rs Gold profit each.
Pros : Makes alot of cash, for every 1k soft clay you make, thats about a 70k profit.
Cons : Gets extremely boring, so i would reccomend doing 300 a day, that way you wont go crazy.
Method 2,
Items : Cowhide, money, and maybe armour and a weapon.
So, if you already have a fair amount of money, buy as many cow hides as you want from the Runescape grand exchange. (you can also kill cows for them, that will also give you xp in your combat levels.) Make them into hard leather. Then, sell in grand exchange for max price or to a player who is buying at a high price. I would reccomend doing this in Al Kharid, as there is a tanner next to the bank.
Pros : Of course, cash.
You will get xp depending on what method you use.
Who knows, you might meet a friend while tanning your hides.