This is a list of books and articles that I've found useful and interesting in terms of personal philosophy and becoming a better person.
William Irvine: A Guide to the Good Life
This is a modern, well paced introduction to Stoicism. I think Irvine overthinks things sometimes, but it's as good a starting place as any.
Epictetus: Discourses incl The Enchiridion
This is a link to the George Long translation, which is the one I like the most. It can be a challenging read at times, as much for the concepts as phrasing. It's a very concise and hardline approach to Stoicism, and I love it.
Seneca: Letters from a Stoic
Letters from a Stoic is interesting both for the concepts and the voyeristic look at the private conversations of one of the most influential Stoic thinkers. Because these are private letters, at times they meander along and get side tracked, but there is some pure gold here.
Marcus Aurelius: Meditations
I'm yet to get very far into Meditations, although other people have rated it highly. It was the first ancient Stoic text I tried, and I put it down fairly quickly and moved to the much more enjoyable Enchiridion. I look forward to coming back to it with an increased understanding of Stocism.