Area sounds about right, quick poke gave me this map:

It is in Czech, but it shouldn't be that hard to understand. Note, Slavníkovci were an offshoot of ruling house that was appointed to protect the trade route running through the area, since they were subject of the Duke it's mostly irrelevant, although if there's a lack of generals, their head of family can be included (but only thing I found about him is name Slavník and year of death, 981, age unknown. Almost entire family was massacred in the year 995 on duke's order).
As for military, I found virtually nothing about composition, seem to be common levied mob and few men-at-arms. If you want, I could translate some generic unit names if you're going that way...
Edit: oh damn, sorry for doublepost...that happens when switching between too many tabs
And another edit: I have only free electronic sources (AKA interwebz

) available right now, but if you want to do some research about army and got access to something better, best place to start would be Battle of Lechfeld where Bohemian army participated.