Here are a few common methods:
NeoThiever- High risk, low payment. Expect 20m/hr per account, no reqs.
Mage Bank thiever- High rish, high payment. Expect 100m/hr, no reqs.
NeoZulrah (Vip)- high risk, medium-high payment. Depends on drops, expect alteast 50m/hr if unlucky. Reqs; Max combat, 75 prayer. Atleast 20-30m for gear (cheapest).
NeoMiner + Smither- medium risk, medium payment. Mine rocks, smith them into bars then cannonballs. 30 smithing and mining (atleast 40 for mining is recommended)
Karambwan fisher- High risk, medium payment- Atleast 30-40m/hr. Need 60 fishing, 99 cooking is recommended to cook without burning.