Choose an organisation that does marketing.
Choose an organisation that you are familiar with and you are able to observe the marketing efforts.
If you choose a large organisation that markets many different products, it is very important for you to choose only a product or product line. For example, if you choose Protons, do not address the entire car model, be more specific, choose a model.
If you have trouble choosing an organisation, go to the mall, surf the net, or look in the yellow pages, you are surrounded by marketing organisations.