Honestly i follow about three or so house rules when play ANY TW campaign:

1. Keep as many troops alive on the battlefield as possible, DONT be wasteful with them.
2. ALWAYS have construction queues going. DONT EVER not be building or recruiting anything if u can help it, cuz otherwise i RP it as an economic collapse.
3. ALWAYS seek revenge for FM murders/killings, even if it destroys your faction, do it. And believe me i have lost several good campaigns due to this one.
4. Always have at LEAST a lvl1 barracks in all of your settlements in case of emergencies.

Now for EB specific ones:

1. Expand to your factions "historical" area b4 blitzing everything. EX, Germans stop at the Rhine, and take everything on the eastern bank b4 even CONSIDERING crossing it.
2. Always rush to natural barriers; mountains, rivers, ect...; in order to get safety for your faction, both RP wise and strategically.
3. When i go to war to the death i MEAN it, the opposing faction MUST die!!!