Order of logograms

Because logograms cannot be alphabetized, how are they ordered?  There
are Chinese dictionaries, aren't there?

I have a book, "A Guide To Remembering Japanese Characters," by
Kenneth G. Henshall.  It contains "the 1,945 characters prescribed by
the Japanese Ministry of Education for everyday use."  The first 996
are arranged according to the six-grade system used in Japanese
schools.  Then there is a General Use section.  But I don't understand
how the characters are arranged within each section.

Is there some standard way by which the Chinese arrange the logograms?

What I want to do is develop a writing system for Senjecas similar to
Japanese: the use of a logogram for the root of the word, along with
letters for prefixes, suffixes, particles, etc.

Charlie

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