I am currently in my first year of undergraduate study, studying sociology. I have decided that I would like to go into teaching after finishing my degree, teaching sociology and/or english literature. I already have A-levels in Sociology, English Literature and Psychology. Does anyone have any ideas on the qualifications/training I would need to go into the field of teaching I have mentioned?

Any info would be greatly appreciated :) Thanks!

Well you'll need to finish your degree and then go into teacher training.
There are a number of courses available.
Best idea is to check out the gov site for more information: Teaching - find jobs, careers and courses to become a teacher - TDA (http://www.tda.gov.uk/Recruit.aspx)