How do you get 15 mil on runescape

There's some trees outside the grand excange, cut down them and sell, it's surprising how much money you can make. Also, the 60 air and mind runes you get from the magic tutor in lumbridge can also help the total.
Bones also sell well.
Once you get your mining to 40, mine gold, it sells for 500 gp each. A good place to mine gold is the crafting guild where there is 8 gold ores
oh and about da bucket: u only need one bank space its also VERY slow.
A better way is to go to the lumbrige cow fence and get a full invitory of cow hides they sell very fast and they get about 4,000 every full invitory. Hope i helped you good luck!
Oh yea and you can go to rsbot.org and download rsbot this will help you get levels faster and make alot of money. All you have to do is go to www.rsbot.org and click on the link that says download, if this is to confusing for you go to www.youtube.com and search for "rsbotdownload with commentary" Good Luck!
here is a tip when your downloading rsbot, if u click the download link and see a popup blocker bar up at the top, click on it and press download file. hope it helped!