The teacher just gave us the instructions and we picked countries. Nothing else.
You'll just have to get a feel for the other players. Maybe even confer with them in between moves even if you have no agenda with them. Just be diplomatic. Find out if they know anything of history and if they plan to move accordingly. If not, it's just a game and anything can happen. Just be mindful of any nation moving fleets or troops towards your borders. If so, it's not likely to be a goodwill gesture!
For your opening moves put your Rome fleet into the Tyrrenian Sea headed towards Tunis. With the intent to gain a supply center on the next move.
Or
If you are worried about Austria-Hungary putting a fleet into the Adriatic Sea, move your fleet to go into the Ionian Sea and keep the Austria-Hungary fleet permanently bottled up.
At the same time move your Naples army northward unless you sense Turkey coming right at you. Keep your Venice army exactly where it is, unless you want to mess with Austria-Hungary right off. If Austria-Hungary begins moving armies into the Balkans, it may be a sign that they don't intend to fight Italy any time soon. Expect Turkey to take Greece without a fight. But if they go any further west, you'll be at war with Turkey pretty fast.
One critical understanding of the game is how you convoy an army with fleets. You can move an army a great distance by convoying them over fleets, as long as you have fleets inter-connected in adjoining bodies of water. If Britain doesn't head into the Mediterranean Sea, you can go for Spain and Portugal apart from Tunis to gain supply centers and add more fleets or armies. Provided of course the French don't object! Generally Italy is easier to play if you concentrate on fleets rather than armies.
Too bad you didn't pick Turkey. Much easier to play. Italy is a nightmare...unless you have solid alliances from the outset. But as a game, I can't imagine your outcome being critical to being graded or anything. Probably just an exercise to see what you do as a serious diplomat far more than as a tactician. We had no such exercise in my International Relations class, yet the most important thing taught was the value of
Quid Pro Quo. Which is bound to come up in your game!