Realistic core force

[Imp]

Realisticly with just one company you would be lucky to get much of anything.
Add 2 scouts MMG if not alreay attached maybe ATRs or ATGs. 1 or 2 max mortars for arty.
As Germans the chances of any armour is really remote but if want to add 2 or 3 vehicles you could. These would not normally be tanks best bet when available Stugs
As a general guide 3 companies is a good size as for most nations tends to be smallest size extras are allocated to. 3 companies would give you an offboard battery for instance in most armies.