I'm not sure I'd recommend Aurelius' Meditations as an easy-to-read introduction to Stoicism - it's a hefty tome (in the longer editions, I can't speak for the ~100-200 page versions) and incredibly repetitive, which is no surprise given it's essentially his personal journal. I'd much sooner recommend "Letters from a Stoic", a compilation of Seneca's letters to his friend Lucilius. It's much more conversational but still covers all the important ground of Stoicism.