Glory to Jesus Christ!
Amanda in post #2 gave a very good direct answer.
The Ancient Christian Writers series is available from Paulist Press, although not all of the volumes are currently in print.
Paulist Press
They also publish Classics of Western Spiirtuality, which includes some Patristic works, and cheaper than the ACW series.
I have and like very much “Four Witnesses” by Rob Bennett mentioned by Sherlock in post #4. I lend it out too!
I would also like to recommend “Beginning to Read the Fathers” by Boniface Ramsey, I think it is from Cistercian Press but I can’t find my copy right now to verify.
Another compilation I would recommend is the Philokalia,
very popular in the East. Many writings from the Patristic period are included as well as later Orthodox writings in the same tradition. I think it was compiled in the 1700’s or 1800’s and is available in four paperback volumes. Published by Faber & Faber.
Finally, there is Patrology, by Quasten. Be prepared to drop some big money for these books.
In Christ Always,
Michael