Oh boy! It's been so long... Ahhh... for starters try
www.aminet.net and go to "Browse" and look in dev/asm. That should get your feet wet. If I remember correctly Barfly was a good assembler. There are others over there as well. Check the readmes. You will also find some coding samples there. You could also need the RKM's (ROM Kernel Manual) which explain everything (or almost) a coder needs for the Amiga environment (unless you bang the hardware:-). They are out of print but occasionally some people sell them. Good luck!!!
