Welcome h.nur beyaz erkizan! It's been recommended many times but as for practical living I would recommend Emily A. Austin's "Living for Pleasure: An Epicurean guide to life" for an Epicurean approach to modern living. It's ah absolutely delightful book in my view, just repurchased it for the audio book and got my dad to read it.
Also Norm DeWitt's Epicurus and his philosophy is an excellent guide to the history of Epicureanism and you can get it online through Agathon library.
As for Diogenes of Oenoanda specifically I may recommend "Martin the Epicurean" by Martin Ferguson Smith who is the main translator of Diogenes I haven't read the book but knowing Smith's other works it's quite well written.
As for your own studies, Martha Nussbaum's "The therapy of desire" may interest you, she's more a fan of Aristotle than Epicurus so I disagree with her on some points. Still I find her a valuable resource, she at least isn't actively malicious towards Epicurus and praises him quite a bit.
Thank you very much for the message! Martin the Epicurean is really so interesting. I have known M.C.Nussbaum since my PhD studies, and I wrote a book on her titled From Aristotle to Nussbaum -in Turkish- Again, thank you!
