One inventory of lobster is worth around 10k but you need 40 fishing for that. Mining Rune essence is good moneymaking but you need to complete rune mysteries quest. Making and selling water runes is very good but you need rune essence and level 5 runecrafting. Mining gold, coal, adamantite or runite is extremely good moneymaking but you'll need level 30-85 mining. Getting cowhides then tanning them into leather and selling them is good moneymaking. Getting big bones from hill, moss or ice giants is very good moneymaking. Fighting monsters like cockroach drones, cockroach soldiers, cockroach workers, moss giants, ice giants, ice warriors, minotaurs (for iron arrows), lesser demons and greater demons.
Hope it helped =)
There are three good ways to make money with Runescape as F2P as you're aiming for 250k/hour. They are described here below
look at link below, it has wc training for p2p and f2p
It depends whether u are member or not
F2P=Free to play, if a certain of your levels is high,and gets recources like logs/ores/fish try finding out if ashes/bars/cooked is worth more and then sell them
If your not cheating, then the fastest way is to buy high level logs and fletch them. Since arrows and bows are sellable you'll be loosing only some of the money.
High Alching, Killing Hill Giants and collecting B Bones and selling them.
The bestest and fastest way is to Craft Nature Runes.
Try mining. Or get some other resource. Then sell it at the Grand Exchange. If this is too slow for you, and you were expecting some "magical shortcut", well, there is none.
fly fishing is always the faster option in ruenscape even for members
Well if your f2p you can kill hill giants and bury their big bones as it levels prayer fast. If your a f2p player with more money you can just buy the big bones to bury. As a member its much better to use house altars with your bones so you get much more exp from each bone.
The best way would most likley be killing cows getting the cow hides and selling it or sheering sheep and selling the wool :)
Work your way up to 63 hunter and hunt carnivorous chinchompas until 99 hunter. It's the fastest and easiest way to get 99 hunter and you make a lot of money on the way.