Welcome Zerohour1974,
real (not just emulated) Amiga is a fun addictive machine and it is just too easy to start spending way too much money on expanding it and too much time exploring it
Software wise, I just did a quick search with a term 'essential' and got this thread:
Essential "must-have" Amiga programs -
http://eab.abime.net/showthread.php?t=9310