Japanese and PostgreSQL

Hello There ,
I hope u answer these questions:
I have installed postgresql DBMS , with SQL_ASCII
encoding, so far, it is working ok, I think I might
have probelems when manipulating the
strings(substring, lenght), but now I don't do i.
Could anyone tell me , with reasons, the best
encoding?
Also I would like to do text search, I 'd like to use
a full text search engine, Could anyone give me a hint
what
it is the best solution for japanese characters ?
I have looked at tsearch , but I am not sure.
I would appreciate any reply as soon as possible.


deibys

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