The earlier version guides are pretty much still current. Look to them for a guide to get you started, the war with Norway, Russia & Polish-Lith is still set to occur in version 1.5 unless you get a full alliance treaty with any of them.
In my wifes current campaign, all three declared war at turn 22 in the same turn. Its not a major thing to deal with though the main drawback is Norway blockading your sea trade as before this you should have plenty of trade and income so make sure you spend extra coins on FLEET.
Prior to this she had taken a non-agressive approach building trade treaties and getting friendly with Great Britain, Austria and other large nations. This meant she had a large sink-hole of cash to see her through the Norway blockade and to rapidly build armies to keep Russia and Norway busy. Pole-Lith has not sent any armies as they're (as with other games with other nations) busy fighting Austria by this point.
Taking this route gives you a chance to really build your infastructure and tech so you don't have to worry about cash shortages during long wars.
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