-Don't let villagers be idle ever, keep them gathering resources.
-Use Auto-queue on your TC to keep producing villagers, you should be making them steadily until mid-Heroic or so
-Use waypoints with your TC to get villagers to work right away (select TC, right click where you want them to go)
-Hit classical earlier, no later than 6 minutes
-Take the map into consideration. On Anatolia it's a good strategy to build a dock in early Classical and get fishing going.
-Keep your sheep close to your TC, they might be useful
-Take more TCs when you can, they give you more population and let you take control of the map.
-Expand your economy as you advance until you can produce a constant supply of military units, and remember to get the econ techs
-Anticipate the need for houses, but don't build more than you need, build them as you expand
-Don't let resources pile up. You shouldn't ever have much more than 1000 of any resource, the peak should be just before you hit the Mythic age button. Stored resources aren't killing your enemy; use them to build armies and expand your territory and economy.
-Know the tech tree well. Know which units counter which, and try to make an army that counters your enemy's. It's wise to make armies with units that compliment eachother, such as axemen and slingers to kill infantry and archers.
-Keep scouting the map to see where your enemy is and what kind of army he has. You can build a counter-army to his if you know what he's making.
-Using all-myth units will usually only work for the first battle, after that your enemy will have heros. This time he didn't make a single one, which is what allowed you to do so much damage with your myth units.
-Take control of the important parts of the map; gold and TCs are important to have, take those and build military buildings around them.
-Build barracks and midgol so that you can switch to a human army when you need to.
-Remember armory techs, they will greatly improve your army.
-Raid his economy whenever you can.
-Keep the pressure on. If you have an army, use it. Only retreat when you are going to lose it, and then make sure to have counter-units built to deal with the enemy when you go back to fight.
-If he starts walling himself in, stay close to him and build military buildings around him to lay siege to his base until you can get rams to destroy the walls.
-Prepare a place for your titan with walls around it and defensive buildings to keep him out.
-Once you have your titan, keep your army close to him to kill any heroes that might try to kill him, and to destroy him faster.
You may want to look at some expert recorded games to see how they build up their econ and make armies.