Here's my take on Macedon (my first ever R2TW campaign, very hard).
Steps:
1 - Eastern border: take out the Thracian tribes;
2 - Northern border: Northern barbarians did not give me breathing time so i had to go after them (ended up holding a region in Pannonia and Illyria). The plan was to just get total control over Macedonia without the diplomatic hit but because of the barbarians Sparta beat me to it;
3 - The Aegean: Sparta and Athens are my allies and like me a lot so i took to the sea - Crete and Rhodos;
4 - Macedonia: finally! I had to backstab Sparta, since they were loyal and had smth like +200 relations but it got me my second whole province after Thrace;
5 - Athens: and voila the third province is here. I managed to make Athens brake from being my vassal and attack me too;
6 - Cyprus and Asia Minor: Pergamnon, Pontus and Bythinia are my vassals and since Parthia was massive at this point and i already was at war with Egypt and Cyprus i just decided to keep those 3 as vassals (actually now it's 2 since Arminia as Parthian ally killed Pontus). So i went forward and conquered Cilicia and kicked the Parthians back to the desert. While i was doing this in the east, the Bastarnae and Gatae were giving me trouble back home but i had 2 armies left defending and pacified those two. I made them my vassals... they hate me though so it's just a matter of time before they turn on me again. Still i don' intend on getting deeper into poor barbarian lands so i just retreated my armies back to Thrace and Pannonia;
7 - Syria and Persia: This is still in progress - a march from Antioch to Babylon;
8 - Egypt: Egypt is long gone due to a civil war and Alexandria is now in the hands of a desert ally of mine. In time it will come back under Macedonian rule though
9 - Rome: Once the east and south are secured and the northern barbarians are held in check i'm going after Rome (not a real threat atm, since the Dalmatae rule half of Italia).
Diplomacy:
- At first Athens and Sparta were my loyal allies but i had to dump them in order to secure the Balkans;
- The Ardenai (spelling? The tribe in Illyria, above Apolonia) are my trusted ally almost from turn 10 and i don't think i'll backstab them;
- Barbarians get into alliances only by force (so after conquering them);
- NAP's are pretty helpful as a step towards better diplomatic deals;
- Asia Minor small kingdoms were relatively easily made my vassals as the campaign moved on;
- Trade agreements were relatively hard to get at first but with time i managed to get a bunch which really helped my economy.
Armies and characters:
- First tier armies: it's levies and militias, so you're going to need to use the generals to hammer and anvil (so maybe zeal generals are the best option). Used peltasts for supprt and flexibility. I learned the hard way how OP field artilery is - you do not have to! Get a ballista soon and watch how it gets you 200 kills per battle!
- Second tier armies: normal pikemen and hoplites. Also: archers and agrianians and citizen and sarissa cav. Hoplites in square on the wings when you're defending are great. Don't forget to put your pikes in bracing mode - it makes a difference for me. I like to have my generals with the cav and i like to have generals with different attributes: zeal are tanks, cunning are ambushers and authority are boosters. Now i have a good champion in one army and a diplomat in the second field army (the diplomat is great for reducing costs and if you do not need a diplomat in some province to keep income hig and unrest low - then put him in an army);
- Third tier: here's where i am now - 4 Thorax pikes, 2 Hoplites, 2 Theuros spears, 2 Royal Pelts, 2 Light Javs, 3 Archers, 1 Ballista, 3 Cav units (usually one Thessalian cav and one or two Citizen cav), 1 Companion cav general;
- Fourth tier: i'm no there yet but i guess i'll swap the Hoplites for Shield Barrers and Thorax pikes for Foot Companions.
*** I totally skipped the mercs building. Cretean Archers are great though so maybe i'll add some merc building later on. I upgradede my guys with armor and weapons every time i conquered a province that had the building that was required. but immideatly after upgrading i tear the building down since it's usually -10 public order.
- Used my champions mostly to calm down the population home. Sometimes i used them to neutralize an enemy army (military subversion with the champion - so that they can't reinforce which made some battles much easier). I used my diplomats to convert some of the barbarion regions but mostly i used them in my armies to keep costs down. Spies i used for a multitude of purposes, mostly doubled with champions to weaken enemy armies and settlements.
All in all the start was very confusing but i think i'm getting a feel for things now...