There is not one Buddhist meditation that can be done by a puthujanna. Buddhist meditation can only be done on the basis of Right View.

So if you want to practice Buddhist meditation, first learn mundane ("intellectual") Right View comprehensively, and develop it for the purpose of becoming a Stream Enterer.
It does not go any other way. "Mindfulness of breathing" without being a first Sotapanna is not a Buddhist idea.
5 precepts is the minimum for mundane Right View, 8 are necessary if you want to go beyond it (or perhaps 5 + celibacy in the Buddhist sense).