It is in your interests as an individual and citizen of a democratic society, as well as society itself, for you to become acquainted with the policies and ideologies of the relevant political parties.
My personal advice would be to read the information on websites of the three major parties (Labour, the Conservatives and the Lib Dems) and try and get a feel for who you gravitate towards initially. Then, I would suggest you try and watch shows like The Daily Politics and Newsnight on the BBC iPlayer, to get a feel for the way that the politicians of the respective parties are behaving and explaining the policies.
When you "find yourself" politically, you'll find making these decisions and keeping abreast of current affairs and how they impact the country much easier. Politics is very much a life skill, like riding a bike. Once you work it out, it's unlikely you'll completely stop keeping on top of it, or forget how to do it altogether