1. There are only so many industrial complexes, so after tehy are all bought, then you can’t buy any more?? So is it a good strategy to buy em quickly to prevent the other side from getting them?
Yes, once all the factory pieces are used up, no more can be built. Whether its a good strategy to use them all up is debateble. They cost 15 IPCs each and provide no offense or defense ability by themselves. Your opponent can build units and just capture the factories they want from you. If you know that building factories is fundamental to your opponent’s strategy, then you maight consider buying them out.
2. If i attack an island/coast with a sub, and transporter (w/ tank), and there are 2 infantry and a sub defending…. can the attacking sub shoot the land units? And if all the defending land units are dead, can the sub hold the island?? Or do the tanks just automatically take it?
Okay, there are really 2 battles happening here, and not 1. First the Naval battle occurs. Only the units in the Seazone can participate. Units on transports can not fire. If the transport carrying them is sunk, then the carried units are lost too. Ouch!
If the attacker destroys all enemy units in the sea zone, then the transports unload their cargo in to the land zone, and the land battle occurs. If the attacker has battleships in the seazone with unloading transports, then the battleships get a single shot at 4. The battleship can not be hit by defending land units.
The sub is a naval unit, so if it survives the naval combat it can not participate in the land combat at all. If the attacker has planes involved they must be committed to either the naval battle or the land battle, but not both! Make sure you have the movement points to get the planes to the seazone or land zone for the battle and get back to a friendly territory to land.
I hope this answers your questions. Just remember that the seazone and the land adjacent to it are completely separate areas, where separate battles occur. Naval units fight in seazones, then transports unload into land zones, to fight separate land battles. The only exception is the single supporting shot for a battleship to support an amphibious assault.