Hello cello
Do you play in any ensembles at school which you might be allowed to try directing sometimes? Would some of your friends occasionally turn up to play for you and take it seriously?
When I was 15, my school music teacher gave me the junior recorder group to train and direct. I probably learnt more about conducting then than I ever did at music college or from books! Yes, do a search for books on google or amazon and see what you can find (not likely to be cheap though) but you just can't beat getting help from a good teacher and actually starting to do some conducting.
You may find you love it - or you may find it's not for you.
Have you asked your school music teacher if they have any tips for you?
The other thing is to try "conducting" to CDs etc (probably in private) and see how it feels. Might sound a bit far-fetched but plenty of pro conductors have done this in front of a mirror to get their technique right as they were learning their art.
Finally, just remember becoming a professional conductor is a very hard profession. Many set out but few make it. So aim to become a really good all-round musician too so you've plenty of choice later on.