Some advice about club jobs (II have expertise in this market only or I would comment on all):
Unsure your SL age, but quality businesses will not hire anyone under 30 days old or more, depending on the venue. Use this time to gain experience in your desired field; if you want to work in a club, hang out at clubs and pay attention to how things run and what the staff does there. There are many job sites in SL where employers list the jobs they need filled. Just search places for keyworks like "jobs" or "employment." But again, you need to understand and know how to best do a certain job. There are schools in SL but I think they are nothing without experience. Some jobs, like DJ, you need much more than exp (a stream, dj program like SAM, large playlist of mp3s and a way to easily and quickly d/l other songs upon request, and most important - a fun personaily that keep guests entertained). Another idea is to try out the job at a new or low traffic venue to ease into a position slowly. You can even research what SL jobs entail on sites like Wiki. Hope this helps and good luck.