Welcome tariq !
My recollection of The Art of Happiness is that I liked the translations but found the commentary somewhat hostile to Epicurus. That said, it's been a couple of years since I read it so my memory could be hazy.
I, too, discovered Epicurus by way of Stoicism. I was reading Cicero's On the Nature of the Gods, which is extremely hostile to Epicurus. Cicero's arguments were so over the top that they convinced me to find out more about Epicurus. And here I am, years later.