Every Resident of Second Life can get money in one of several ways.

1) A weekly stipend. Basic accounts (created before 05-29-06) get L$50 if they logged in at least once during the week, and Premium accounts get several hundred Lindens per week - how much depends on when the account was created..

2) Buying Linden Dollars. Linden Dollars can be anonymously traded with other residents for currency. You can click on your account balance (in the top right corner) to be buy directly from the LindEX currency exchange on the second-life website or surf there directly using your internet browser. Linden Dollars can be converted to or from US-Dollars. Market forces set the exchange rate.

3) Provide a product or service that other Residents are willing to pay for. People often advertise for event hosts, dancers or other jobs. You could also look at the Employment Ops forum at forums.secondlife.com