-Scout your surrounding area well before you send your oracles to find their base. Its more important that you find all the gold mines and settlements, because in the early game your enemy will be trying to take these off you. A good player knows how to beat a defensive player. So don’t let him steal your land!
-In transition to classical: build an economic guild and have a total of 3 houses, put them and your temple around one of your towers (so by now you should have 3 of your 4 towers defended!) in transition, get the 3 econ upgrades for hunting, gold and wood. Unless you see that there is not much hunting on the map, you won’t need husbandry just yet. Remember that it is not as beneficial for Atlanteans! Realise that the cheaper upgrades benefit you in that - they let you get those upgrades earlier than your ally The fact that you save resources is not the only good thing about it!

Against an aggressive player – advance with around 5 on food, 2 on wood and 2 on gold. Aim for a moderate advance time.
Against a more defensive player – GO FOR TWO TC’S! Be very careful how you do this, don’t try to build it too early, you find that your in a mess with wasted TC time and not enough to build a temple. Do it like this - First get 3 on food, one on gold and two on wood, send your 6th to a settlement you want to take, if your think they are going to raid you early, take one that is near you. If you want to be a bit more adventurous, go for one near the centre of the map! After this build another 2-3 citizens, and use you TC builder to put your temple near your 2nd TC. This BO isn’t designed for water however.
This will leave you with a later advance time, but IT’S ALL WORTH IT.
On water its not hard to have a large fishing force early in the game, you’ve got cheaper fishing ships and faster wood gathering!

The classical Age

If you really like Oceanus’s techs and his healing abilities, then by all means, go for it. But on land I highly recommend Leto for the Automaton. Put your TC on repeat build citizen, if you’ve got 2, repeat build them both, your economy BOOMS! Aim to have 5 on food, 6 on wood and 6 on gold before the heroic age. With 2 TC’s this is very easily done. BUT WATCH YOUR POPULATION. I often make the mistake of getting too many citizens and finding myself with a much smaller army than my enemy.