Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure.
In the extended practice scenario, both Russia and Germany can only play 2 Orders per turn? Is it because the markers in the OB Display in 2?
Correct. As Brian stated, each scenario will give each side's "# of Orders" and, when doing a roll-your-own scenario, each purchased OB will assign its owner a particular "# of Orders".
what does the troop quality mean also as far as gameplay goes?
Brian answered this very well above (thanks, Brian!). Troop Quality is more or less irrelevent unless and until a Team is somehow created from a squad.