One would assume that punctuation for a new orthography would follow the conventions of either the national language or a major local language. This is not always the case. Considerations of both grammar and phonology should be taken into account.
Duitsman, John. 1986. Punctuation in Thirteen West African Languages. Notes on Translation. 113 (6):27-32.
Hill, R. L. 2003. Where’s the Point in Psycholinguistics? An analysis of punctuation, eye movements, parsing and prosody. Ph.D. thesis. Dundee: University of Dundee.