I learned with the Germans who starts out with more organization or morale early war. (I think)
I started in the month they get the PZ IV F2 to get the long L/43.
I used
1x Beobachter arty spotter
2x Snipers
2x MG34 HMG (lafette)
1x LeFh 18 Howitzers (4 guns)
1x SdfKz 222 (3 AFV's)
1x PzIV F2 (4 AFV's)
1x Company of standard wehrmacht inf.
After getting used to things, I added more stuff in, like 88 mm and a Motorized company (later mechanized by switching out the Opels)
I guess Ts4 has a more balanced noob-friendly build than I used, but it worked for me. I feel it is hard to have a good balance of armor and infantry. I fought my first battles in North Africa, to use my superior range on the guns (sniper, HMG, L/43 and 88mm)
Mechanize if possible. I lost so many trucks to enemy fire, while the Sdkfz 251's could chill and lay supporting fire with the MG. The 222's are great to wolf pack on a flank and scout ahead, but watch out for Bofors AA, those shred them to pieces.