Well outside of the game world, you have a tactical map.
From here you can add military districts (for defense + drop shipments of reinforcments), Merchant districts (For drop shipments of resources) and research districts (To give you new techonology earlier in the level)
You have to choose where to attack next, bearing in mind the location of the enemies on the map, and where they may attack next. You might find yours self surrounded if you aren't carefull, but then only really if you suck. You can use this map to make the game easier. Go after your enemies allies first, store up your city building points for the last match etc. You can also purchase military units to increase the amount of force you have at the start of the game. Also, upgrade your unit levels and give you (plethora) of heroes new skills. (Mega fun!)
In game, the initial tactic is get a fast income of rescources. Like all RTS's games I guess. You basically measure your rescources, by the amount incoming per minute. The amount where you start to be able to turn your army around in most cases is 200-300 per minute. You have to earn both "Timonium" (some sort of magical construction matierial *cough*tiberium*cough*) and Wealth (cash). The problem is, you are limited to how much income you can gain by the size of your city/cities. So you also have to buy new merchant/military/research districts in the level. These increase your income cap/population cap/amount of research points available respectively.
The problem lies in that if you build something, the next time you build one of those it costs more. So cities become an expensive hobby.
However, that said, it's not too hard to get rescources at a decent rate, because you can usually defend yourselves from the oposition because they like to constantly onslaught you. Odd ay? Lemme explain.
If they are sending, constantly, their units all the way accross the map, and you are simply letting your new units sit in the base, probably increase at a much slower rate, they never really build up an army. Because they have little tact, to be fair. They just plow in, and you use your abilities and skill to kill them efficiently.
Where as if the oposition would build up an army at the amazing rate they seem to be able to, and send it all at once - regrouping outside of your borders, they'd crush the fuck out of you.
Essentially, they're constantly sending second rate stuff at you. Luckily.
That said, I've struggled at a few points in the game. Sometimes just out of stupidity (charging the final mission in a scenario when he still had a nearby ally) or sometimes it is genuinly hard to build an army with them constantly charging you.
Tactically, yes the game is a little dull. But fun wise, it's great. And now for a screen shot.
First, a portion of my army.
http://img.photobucket.com/albums/v463/ ... myarmy.gif
Second, the graphics sliders.
http://img.photobucket.com/albums/v463/ ... liders.gif