Also, we're using the essentials economy functions a bit now - there will be trading signs: http://wiki.ess3.net/wiki/Sign_Tutorial
It now costs you $150
Costs you $50,000
Find out how much the stack you're holding is worth.
/sell itemname amount
example - /sell dirt 10
Sells the set amount of item you are currently holding for money.
Sells what you are holding
/pay player amount
example - /pay Hydra 100
Pays the player that much money
As always, /help will answer most questions.
Also, you start with $150.