You should really run some numbers about this first.
GoldFarming and the price of gold is at an all time low right now.
First, figure out a (few) methods to make decent-good gp/hr on RS.
Then figure out what skills/stats you will need.
Then buy or macro the accounts yourself, you'll need somewhere around AT LEAST 30+ if you want to make good/decent money/if you want to buy a computer to dedicate to it.
Then figure out how much gp/USD per hour you will be making.
Figure out how long it will take to cover your computer costs/break even point.
Also factor in how much time it will take from your day to monitor/manage all of the accounts. Any time RS updates (depending on what bot you're using) or the bot gets stuck, you will have to manually log in and fix it.
You'll also need to walk them all over to get proper items, equipment, transfer money, etc.
It's not fun, it's not pretty, it's not for everyone.