Choosing a product - making a decision

Deciding on the product or service i want to advertise has proved difficult so far, because its a big step in the process. My research has been very broad based on many areas of TV advertising, without me narrowing my research to specific types of products, this has given me an overview of advertising as a whole, but i want to look deeper now into advertising in the particular area of the product i may choose.

After some research i have already decided the following things , these may change, and i may add to the list, until i decide on the product. Here i am just trying to explain my thought process -

- i want to advertise a physical product, rather than a service or something digital based, purely as a personal choice, because i think i would prefer to advertise a physical object

- something simple, a new brand of an everyday item, i want something mass market and not neccesarily different to other brands, as i am interested in perceived brand differentiation, which is where the product has no real differentiation, and its competitive advantage is created through the way it is advertised and marketed.

I am no closer to deciding on a product because it is such a big step towards the end product, i dont want to commit to a product too early and rule out other options.