How do you get these jobs. Mixologist??? Where do you apply I just don't get it.

You don't apply to be a mixologist in the sense that you apply to be in a normal career or profession. When you go out and you see an unattended bar you can click it and you will get the option to 'moonlight as mixologist' (You can also do this at parties). Then your sim will tend the bar and collect money. The higher your skill, the better quality drinks you make, and your unique drinks will all add to getting more money. Some bars will need to you to be at a certain skill level before you can tend at them.