Actually, you just need to surf a few websites. No special
access whatsoever. 
The name of the game hasn't changed since Operation Overlord.
Protect your transports, secure beachhead, capture ports. Special
Operations should only be used to support these actions, eg,
cutting off communications, demolishing bridges etc. There hasn't
been that many amphibious invasions since WW2 actually, so don't
expect the concept to differ too much.
I think the technology just makes the effort a lot more bloodier
for the side thats less prepared. Fail to develop a good
anti-air/missile system, you lose ships, men, and material.
Anyway, invasion aside. There has to be some strategic objective to
invade Taiwan. Would it be to occupy Taiwan in its entirety? Or
would it simply to capture the center of Taiwan's government? And
what effects would it have even if they were successful against a
majority people who want to be independent? (Actually, I am more
inclined to believe they prefer and enjoy the status quo)