Want make money? All u need to do is get a good level in a skill like fishing, smithing, mining, or woodcutting. Oh and if u can’t b bothered getting level 45 in wc r something like that, just get ur crafting level to 10, and go 2 seers village, where u can pick flax, go to a very near building and spin the flax into bowstrings, and put them in the bank, which is very near ,too. (1k bowstrings=100k. 10 bowstrings=1k. 1 bowstring=100gp)

All of the other money making guides either suck, or are invalid/fake. Here is a true one that will make you money, if you just don’t have some time into it, as money doesn't grow on trees.

The best way to make money, is to merchant; the main way to merchant, and this is also our motto, is to buy cheap, and sell at a high price. When looking for a good item, you have to look at the price ranges of what people buy/sell them for. So lets take a look at Iron Ore.

Iron ore: 10GP-95GP Possible price. Buy iron ore for 15GP (10GP + 15% = 15GP). And re-sell it for around 80GP. If you buy and sell in bulk, the more likely that a person is willing to complete the trade.

Get your smithing to level 50 and your mining to level 55 mine mithril and coal and smith a whole munch of mithril daggers. Then sell them for profit.

Do the knights sword quest then your smithing lvl should go up to 36 so you can make all the iron stuff so make armor and sell it for 500gp

First get your thieving lvl to 35, then steal from the fur stall in Audrogne till you have around 500 furs. Then go to Varrok and sell them to the fur trader for 120gp each.
  500 X 120=60k   

Go to kajmia isle then pick up lobsters an swordfish and sell to the general store Stay In Tutorial Island And Get Lots Of Items (Food, Weapons, Bronze, Anything) And GO TO The Mainland And Sell Them.

Go to the kamaja island and get your fishing lvl up to 50 and fish for sword fish and get a inventory full of them and sell them to fishin gear store at the port salrim fishin gear store the shop will buy it for 92gp each keep doin it till u get 100k it works
go to port sarim alright, then you see a house, go behind it and you will see 3 runes. Pick them up, they respawn fastly. I am pretty sure about this. To get easy money get a brass key and go to where the giants are kill tons and get their big bones then sell them for pure profit .pickpocket other people such as men women farmers and warrior they all give u money each time and sell a lot of things no matter wut  but make a good deal.

Go to goblin training camp and kill goblins for money, goblin mail, bones, weapons and other stuff. Sell the goblin mail for lots of money.

Ok get your fishing to lvl 40 then keep fishing lobbies and keep putting in the bank more lvls fishing u get the faster it is when u get 1000 or how ever many u want sell for 150-200 gp each if they are raw if they are not raw sell for 200 each so if u get like 5000 u can sell for 1 mill if u have raw or cooked to get over 100gp go to the wizards tower and read the spell book. It should tell you how to get some mystery boxes, get the mystery boxes and click on them. Then with each one do what it tells you to do

*collect or get a new member to collect cowhides and sell to you for 5gp each,
*Next either buy or make steel bars of people for 120gp each or less if you can,
*Once you have same amount of each make soft leather bodies or champs from cowhides,
*Then make studs from steel bars,
*Then use together to make studded body or champs.