If you are talented as a creator ( a builder, scripter, designer, or animator) or as a performer (a DJ, dancer, musician.), you can earn a good income in SL, but it's a lot of work and it does take talent and some investment of RL money to get started. Just save your coffee and donut money a couple of times a week and you will like like royalty in SL.
That's the faster and easiest way, and it is honest. If you don't have money in Second Life, buy it on the Lindex with RL money. That will only make people mad at you, and may get you banned from places that you would like to visit.
