While I'm honored for the suggestion, I actually was going to suggest you ask Lexicus as I know very little about steppe cultures outside of the Fall of Rome.
A bit of google searching turned up
this reading list. Unfortunately, the list is about 20 years out of date and for many topics that starts to be the cut-off point for academic books. That is especially true for Asiatic topics, as a lot of research has been done post-Soviet Union (especially in archaeology) and China opening up to western academics. That said, the list does mention
The Mongols from the 'Peoples of Europe' series by David Morgan. I've read two other books in the series (
The Goths and
The Huns) and they were well researched books with a good overview of the area, albeit a bit dated.
In general, I would recommend looking at books put out by major university presses - like Cambridge, Oxford, or Chicago - along with overview books with essays written by different authors. Two examples that came from quick googling are
The Cambridge History of Inner Asia: The Chinggisid Age or Oxford's
The Mongols: A Very Short Introduction. Even if the books themselves don't have exactly what you are looking for, they should at least give you a robust bibliography and further reading section that will help you track down books on the area you are interested in. (Heck, simply looking at the authors/editors in the introduction books can let you look at them and see if they wrote any books on subjects you are interested in.)
I personally would recommend the Oxford book. It is definitely aimed at a more general audience than the Cambridge book, and is a lot cheaper than the Cambridge book on Amazon.