Re build my site in Bengali language


I want total Bengali site from staring to end. my site now at present in English- Wanted to re build in Bengali language. There are converter but i want starting it self. in google forum some one insist me to put the converter. Also told to change the laguage in setting. i have daone all those thing but not satisfied. Any one who can tell me the actual procedure step by step. Also tell me what are those technical assistance need to be follow.