these are question that are only going to be answered by you doing some reading!!!!
there is a bit more involved than just reeling the information off to you.
there are two options you could use:
1) copying required files over by FTP
this requires you to have a basic understanding of networking, tcpip, obtaining and using an FTP client. You will also have to understand how to configure the apps by editing the XML files and where the files need to resided on your xbox.
2) making a xbox dvd compliant cd/dvd
you could put the files on a dvd and copy them over that way. But again this assumes you have a bit of basic knowledge, like creating xbox compliant ISO files, dummy files etc etc.
depending on how much of this you know depends on how much success you will have. Do you see why it is not just a case of listing step by step instructions now. I would recomend doing some reading both here and over at
www.xbox-scene.com in the tutorials section.