i was wondering a good way to make rsgp on game, and also a good way to sell it for real cash.. if anyone would please help me a little to get started by telling me.
It's easiest/safest to make it by botting, and you really shouldn't need an explanation for selling. The big money is in staking, but it's far more risky than other methods.
Use RSBuddy, at the moment all of their scripts are free. They will be releasing paid scripts soon, but every paid script will be required to have a lite version.
This is untrue. It's just that all scripters with paid scripts have to maintain free ones.
Personally, I would recommend using paid bots such as the ones on oembots.com, rsbots.net, and rs2botting.com (all the same client, really) to minimize your chance of getting banned while maximizing your profits.