1) Check this:
http://www.nyx.net/~rdavis/AmigaHints2.html2) Get Birdie2000 and VisualPrefs
3) No idea. ;-)
4) Open a shell and check if ahi.device is V4 (>version ahi.device full)
5) Enable bsdsocket emulation from the winuae prefs, connect to the net on the windows side, and amigaos should have access to the internet.