There is an alternative to #1 in WiA.
Lets assume you have army 1 two provinces behind army 2 and your target is in the next province.
Select army 1 and drop it onto army 2 - that gives it a move/merge command. Move army 2 to the target. It will wait for the other army to move up and then you attack in a single stack. You need to be sure that army 1 has the movement capacity to reach the province in its own right.
This can be a great trick in the Albany-Montreal corridor as you can really catch your opponent out. It also works in AJE where it can again really give you an unexpected advantage.
Equally, you can target a transport fleet and move out of port in the same turn even though your army starts off inland. I've outflanked Narwhal (a very good, if now semi-retired player of WiA) using this trick.
It doesn't work if the two armies start parallel - or on opposite sides - to the target as one needs to wait for the other.
In WiA watch out for fatigue. If you march to near the full monthly capacity, apart from the eastern coast in the later scenarios, you could arrive too fatigued (low cohesion) to actually fight.
In general in WiA, due to the army sizes, low supply yield and poor terrain you will find that the right leader traits can offset a lack of raw combat power. A fast mover who can reduce your supply needs may be far more effective than someone who appears to be a better battle commander.
... and welcome to the forums
AJE The Hero, The Traitor and The Barbarian
PoN Manufacturing Italy; A clear bright sun
RoP The Mightiest Empires Fall
WIA Burning down the Houses; Wars in America; The Tea Wars