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If you want these changes globally, I would start with the org-latex-classes variable. There is
a lot you can do by tweaking the values in this variable. I found the documentation to be good,
but dense (i.e. a lot to it, needing a git to digest fully). The docs for that variable will also
point you to other variables you can tweak to do what you want.
If you just want to tweak for specific files, ‘#+LATEX_HEADER’ and ‘#+LATEX_HEADER_EXTRA’ might be
sufficient. I find these a good place to experiment with different settings. If they prove more
widely useful, I will transfer/translate them into the other org-latex variables.
Finally, doing an ‘M-x apropos’ for org-latex-.* will likely bring up some additional variables
which my be of interest/use.
Tim