topic/compliment & Sanskrit script

Two questions:

Could someone please explain how the topic/compliment system works, as
with Japanese wa/ga?  I'm not sure I completely understand it, and I want
to use it for Hrondu.

Also, are there any good web sites for Sanskrit script?  Just examples of
the alphabet would be tickityboo.  I've decided Hrondu will use a modified
version of Sanskrit, brought/created by the Buddhist missionary who
converted them to Caa wo Budda.


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