If you're the sort of person that learns by doing, it doesn't matter much whether you learn via doing inline in some other language or just straight-up coding assembler. If you want to take a whack at that, a good way to get started is to use a CPU simulator, so you can step through the code and watch exactly what it's doing.
Easy68k is a pretty handy one - it includes a full assembler environment and a comprehensive help file with a full 68000 instruction-set reference.
(The editor's balky as hell, though, if I were you I'd just use Programmer's Notepad or Notepad++ and load the code into Easy68k from there.)
