It's called Pawn now, despite the "Small" tags on here ;)
What I did was make a good friend on here that knew his stuff and asked him questions, post in the forums once every now and then, etc. Also, it helps if you look at the source of plugins and figure out how they work. Start by either making a small plugin or modify an existing one ( but don't release it ).
When you start your first plugin, have a look at this tool:
http://www.amxmodx.org/funcwiki.php
It well help you a LOT for reference and such.
Last but not least, NEVER give up!
P.S. I'm not too good at explaining things to other people but I try my best
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