No, you just need the hard drive itself to install them, but I wouldn't recommend installing games to your hard drive unless:
A. You are getting another xbox, and want to transfer your data
or B. You have space to spare.
or.....................
C. your parents took away u games.......
no the hardrive you plug into your xbox 360 can only be used to play music, films and pictures from the hardrive on your xbox 360 you can not play any games nor store any xbox 360 data on the hardrive.
no
there is alreay one built in
Only if you have the Xbox 360 hardrive and some software.
No. The games are over 4GB.
yes any size will work
Sure do what u want
Installing games just makes your console last longer since it runs cooler. Also depends on how long you play. If you play frequently, you should install any games you play the most.
It basically cuts the loading time on the game etc...
no u cant
You don't. Welcome to Microsoft.
You can only play some games if you have the Xbox 360 Hardrive and some console software.