Montecarlo method and scenario genertaion technique to generate future events?

Hello All,

Can anyone help me provide such sample codes: How can I use Montecarlo method for future scenario generation. for example I want to develop 1000 random price or demand scenario for next month with certain probability. or I want to develop 1000 scenarios of future Floods intensity and duration in a region? we may have historical data or may not have. Then we have to simulate by using function may be.