Well, you want to created a TTS for [?] language, it's a great project!
Please, take a look in our web site at http://tcts.fpms.ac.be and especially in http://tcts.fpms.ac.be/synthesis/synthesis.html
If you feel good to create a new [?] TTS, you will need this kind of components :
-> a text pre-processing, to isolate words and process abreviations, number, acronym...
-> a grammar processing, to help the task of the next prosody component
-> a letter to phoneme translator
-> a prosody component, that restore the melody of the voice
-> a synthetic voice to produce speech signal.
Well, our Lab can help you to built thoses components especially is the case of an open source target.
I can answer other questions you may ask,