Do you read Chinese? There is a ton of shit in Chinese available about everything conceivable regarding the Chunqiu and Warring States periods aimed at every possible audience. I've been out of the game for a while but I recall this era being remarkably underrepresented in English-language scholarship, except of course in regards to "Early Chinese Philosophy" (which is overrepresented contra 1: everything else going on concurrently, and 2: the transformations of the various schools of thought once applied to actual political practice).

The Qin itself is okay as far as representation, but I think I'm with you in that I don't get why no one has done even a simple, undergraduate-level outline of something like Jin or Lu history, or a thing on the "Hegemons" and the Zhou kings. It may be the Western academic demand for 'evidence;' in China, these are all in essence Shiji stories, backed up when necessary by further details from the Zuozhuan or Zhanguoce, and this situation may be too textually limited for more empirically-oriented approaches to scholarship. They're still fucking badass stories and it would rock if they were more available to non-Chinese reading audiences.

For the Qin, Mark Edward Lewis has a pretty meaty introduction in "The Early Chinese Empires: Qin and Han." From the title you can tell that the focus is on 'the Qin going forward' as opposed to its 'origins,' but there's some background there. This book is a remix of the Cambridge History volume on these periods. Given the almost pure textuality of the pre-Qin era, another cool book to look at is David Schaberg's "A Patterned Past" which is effectively an analysis of the Zuozhuan. This is a very, very heavy one, and definitely aimed at sad and masochistic historiography types like myself: it's by no means a history of the pre-Qin periods. I'm not sure what the Warring States Project has been up to these days, but they've always struck me as... oddly and deliberately revisionist? If you don't mind that kind of thing, reaching back to some very early periods, and a lot of cultural/intellectual history, Edward L. Shaughnessy is an insanely impressive scholar.

Otherwise, look for translations of the Shiji. There are a few abridged versions, but I recall even those being very Qin-Han in scope. This is a great question and I'm actually posting here so it will be easier to come back to this thread and see if somebody has indeed written that (one would think) obvious rundown on the Qin/Han/Zhao/Wei/Chu/Yan/Qi wars in English yet. I'd sure as hell read that shit.

A quick listening guide is China History Podcast