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You have some pieces that will ultimately lead to a good SoR army.
Ideally, you try and find some Soldats to got with the Soldat Sgt x2. . The Std Bearers and Soldat w/Hvy Weapon are specialists for these squads, so keep two of each to field with the squads. You can attach the Kommandant to either Soldat or Shock Soldat squads.
The Shock Sgt and the Shock Soldats will make a fieldable unit.
The Vicar is an individual, so you just need to keep one.
The figures you would need to pick up to fill out your SoR force:
1. Soldats - You can fileld two squads with just 8 Soldats, plus some squad specialists you already have. I personally would try to get 12 Soldats, so you can field two 6 trooper squads plus specialists.
2. Soldat Flammen - at least one. Two if you can find or trade for them.
3. Northern Sons - 8 would be good, 12 would be better.
4. Schwerwaffe - Yeah, you need one of these, just because they are big, ugly weapons.
5. Jaeger Commando - never played one in a game, but seems like an interesting figure.
Check around. Nobleknight games may have some SoR, and I see people selling SoR on E-Bay quite often.
SoR is probably the best Tribes of Earth army, with good troops and support weapons. Shock Soldats have templat weapons, and can be very deadly.
Hope that helps.
MadBrad