She realises that Daisy has been in love with Gatsby this whole time - possibly inferring that they've been having an affair of sorts. In a way, she's admitting to Gatsby that she loves him with this one line.
For the first question that would be based off your experience in applying for jobs but for the second one you should consider the work you will be doing at the job, the commute from your home, if you’re in school the hours at which you can and can’t work and how much you’re getting paid
