1) no, some people forget that and it won't work for them, I am just making sure you didn't forget
2) i suggest copy the files to /home/user/MyDocs, this is the folder that becomes mounted if you connect the computer to your phone with usb mass storage. That way you don't have to use the phone to download them.
Whatever folder doesn't matter, just change to the folder before trying to run the next commands. /usr/sbin/incept is the command you are running, the name of the debian file is telling it what to install.