Reddit mentions of The Landmark Xenophon's Hellenika

For Thucydides and Xenophon I cannot recommend the Landmark series of books highly enough. They are lathered in detailed maps and explanatory footnotes, and come with a wealth of appendixes on everything from Athenian finances to naval warfare to historiography (the study of the sources themselves and how reliable etc. they are). These and all of the books I mentioned are easily and cheaply available on Amazon.

Thucydides - http://www.amazon.com/Landmark-Thucydides-Comprehensive-Guide-Peloponnesian/dp/0684827905

Xenophon - http://www.amazon.com/Landmark-Xenophons-Hellenika-Xenophon/dp/0375422552

I'm interested in this period too and have seen recommended for the immediate aftermath and wars 'Ghost on the Throne' and 'Dividing the Spoils'. If you're interested in the wider historical aftermath for the period and have the appetite for a 1000 page tome then you might want to look at 'From Alexander to Actium'.

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Unfortunately for this time period (the 'Hellenistic Period') we don't have a good narrative history from early sources like we do for some other periods. Herodotus, Thucydidesand Xenephon tell us the story of Greece from roughly 500-362, then we have a frustrating gap for the rise of Philip II (Alexander's father and seen by many ancients as more impressive than Alexander), then various accounts such as Arrian's of Alexander's conquests 336-323. But then there's a big 60 year gap after Alexander until Polybius's histories start in 264 (by which time this is the story of how the Successor Kingdoms and Carthage alike are ultimately defeated by Rome).

[Links in para above are to excellent scholarly versions: Landmark editions in particular are fantastic with maps, good footnotes and annexes etc. But as these are all ancient and so out of copyright you can probably get old translations for free on kindle etc.]