my first bit of advice is dont play with this unless you know what you are doing. you can easily get you 770 to a state where it needs reflashing.

there are instructions for red pill mode at
http://maemo.org/maemowiki/Applicati...gerRedPillMode

to run apt-get you need to install a terminal, eg xterm. see http://maemo.org/maemowiki/ApplicationCatalog2006