Need some advise on Aluminium and Glass Business

I am interested in starting a business of Aluminium profiles and glass in Tanzania. I would like some help from people who know about this business in mwanza and dar.

I can import profiles for making windows, doors, fixed partitions and railings.

Any help will be much appreciated in the field of 1. import duties and sales taxes, market condition, competition, etc.

My direct contact by email is simba1simba at yahoo dot com

Thanks

Simba