i will tell you some ways to make money

1- you can get money with selling coals but you need more than level 60 and the best place is the mining guild.

2- you can get money with selling big bones you can get them from hill giants at wildy you can find them at the hunter area at wildy .

3-you can get money with selling steel bars buy 2000 coal and 1000 iron ore they will coast you 400k and then smilt and then sell the bars you will get like 650k or more i think .

4-you can get money with selling yew but you need level 60 to cut yew trees.

5-you can get money by getting 70 mining then go to alkharied mining place and mine the 2 rocks over there then log out and go to another world and mine keep doing like this and you will get money fast and easy.

6-you can get money by going to lumbridge castle and getting alots of anti dragon shields like 500 then you go sell them at exchange by the lower price lol.