Basic readings and references: where to start

Although I have read some basic articles and book about buddhism, they are all written by modern western sources, and I would like to get to know the foundations. Even when reading this site, I sometimes feel at a loss because I miss so many of the particular terms, and all the names of the classical texts are kind of mixed in my mind, I don't even know where to start. My question is then: What would be a good "programm" to introduce myself in buddhist (foundational) readings? I am aware of other questions dealing with introductory texts to Buddhism, but, as I see it, that is easy to find. What I want is sort of a guide to start navigating the important foundational texts of which I keep hearing/reading a lot, but that I cannot grasp. Also, I would love to learn at least a bit of the languages (Sanskrit, Pali) to improve my understanding of what I read, and some references in this sense would also be much appreciated.