I've downloaded the army book for the Dogs of War, and inevidently, I found large number of units I would like to incorporate into my Orcs and Gobbos army, but can't toss up what I want, can I have one unit in the army or as many as i can afford for my army?

Also, is there a Richter Kruegar model available through Games Workshop? If not, can anyone let me know of an inexpensive and easy way to make one?

I would aslo like to know whether there is boxed sets of the basic soldiers. i.e. Pikemen, Crossbowmen, Halflings, etc?

Any help would be appreciated.

First off, here's a link to the model range for Dogs of War:
http://store.us.games-workshop.com/storefront/store.us?do=List_Models&code=301082&orignav=13&GameNav=13

As far as including them in your army, if I'm remember correctly each DoW unit takes up a rare slot. So you can have as many of them as you're willing to take as rare choices.

Each DoW unit has its own rules as to what slot it takes up in an army. Each entry for DOW units have a small paragraph stating what armies can take the unit and what slot this fills. e.g ruglands armoured orcs are a special in orc and goblin armies but rare in others, i think. so as long as you have the slots free you can field as many units as you like.