Here's a slideshow I did for my students to practise job vocabulary for the TOEIC. The answers are on the last slide.
1. You could use this slideshow in various ways. I put my students into teams of three and gave them a copy of this worksheet. I then showed them the slides and got them to fill in their answers on the sheet. Afterwards, I went through the slides again, checking the answers and getting the students to describe what the people do in their job.
2. As a follow-up, you could play a game of What's My Line using this list of jobs. (See here for a classic example.)