Learning traditional Chinese characters
I hope I've understood you correctly and that by traditional Chinese you meant classical Chinese, or 文言文.

Assuming you have pretty decent knowledge in modern Chinese, you can start, like all Chinese students do nowadays and ancient elites likewise, from recitation and memorization of classical works. 古文观止, literally meaning "stop reading any more classical works after this collection", is a selection, sorted chronologically roughly by dynasty, first published some hundred/two hundred years ago. I suggest you start with essays written in relatively more modern eras.

Good luck and have fun.
ps: there are of course some countably many (not in the mathematical sense) old syntactic as well as morphological (e.g. character "overloading", 通假字) rules that one should always know and that we were also taught after primary school, but I can't help you there because to me, these rules have already become innate and can't be enumerated without omission. But I do know that some Jesuits pastors who visited Chinese back in Ming dynasty have left some valuable notes, many of which titled as something similar to grammaticae sinicae. They were on google books some years ago, not sure if they still are.