microcontroller programming -- how to begin

I have this microcontroller

http://cubloc.com/download/integrated/CuSB22R_UserManual.pdf

it is basically their Cubloc 280 with the relay board and set screw
terminals attached.

When I get it, I would like to, first, just play with it a little bit,
write some hello world types of applications, etc. Do you know of any
websites that discuss how would discuss how one gets started with
microcontrollers. I am a computer programmer, so programming as such
is not a problem, but controlling a microcontroller seems to be a
different paradign from just writing "apps".

i

.

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