I plan to add a bunch, too.
Like special ships that resupply warships in the middle of battle and alternatively used as fighter carriers.
I also need a few escort types, a battleship a dreadnought and multiple types of fighters.
So don't worry you still have time and besides I won't prevent people adding new ship types even during the game. You can use those for forming the next fleet for the following battle.

Anyways, as for the first battle it features the Dominion attempting to break through the neutral zone, filled with mines and FTL jammers.
Also sporting number of starbases on the FPA side albeit as you'll later see that may not give them such a serious advantage.
Dominion succeeding means they penetrate to to FPA territory before they muster a proper defense. Failure means the FPA can react in time and maybe even push the Dominion back in the next battle, taking the offensive role.