You haven't said what you are good at or what you enjoy - that will surely make a difference?
Its okay not to know what career you might want to do at A level (its probably healthy because you cant really know what the work is really like). It's okay not to know with Uni subject choices too - my rule of thumb, with myself and my children, has been about flexibility over specialisation because that leaves more doors open. You can always do a Masters to specialise (that's what I did)
Things like Geography and History give you a good grounding is essay subjects and leave lots of Uni subject choices open
Things likes Sciences and Maths also give you good skills, again leaving lots of Uni options
If you do aspire to Economics / Accounting then Maths is a must, and so are(really) good grades, which takes me back to my first point
Its very early to do so, but maybe get along to some Uni Open days, ideally one where they have a subject fair of some kind so that you can speak to lots of academics/students about their subjects - we found Exeter was like that, we got a really good understanding of so many subjects