presentations

[cazzbazz25]

i have been asked to attend an assessment day for a job i applied for. the assessment will be split in 3 ways. 1st stage is a team disscussion, 2nd stage is role play and the 3dr stage will be a presentation. the presentation will be based on what ever i pick out of a box. i have never done a presentation before and was wondering if anyone could give me any tips/ advice on how to sell in a presentation. i.e how to sell a blue pen to a team of people. or even a bar of chocolate.