First of all I want to say hello to everyone here since I'm a newbie on the forum and to the N900

I just got my N900 and installed some apps and being the lucky guy I am I can't have everything working properly. So these are the problems I have:
1) firefox I've got 2 problems:
---1.1) when I start the app it starts loading then turns off and after few seconds magically starts for real
---1.2) I don't know how to install adobe flash player (or rather which package form adobe's site) so I could watch videos on youtube.
2) media player:
---2.1) on my playlists (with flac files) the media player doesn't play the first file on the playlist saying that it "cannot find multimedia file"
---2.2) I can't "navigate" through flac files
3) how to configure autodisconnect so I could save battery
4) how to rearrange the menu with catorise installed