Trademark

Dear Savitha,
 

Yes you can use the brand name other than company's name.  A brand name may be registered with the trademarks registry which you are using or proposed to use.  

A company need not incorporate a separate company to provide charitable services, however it is advisable to incorporate sec. 25 company if the scope and level of services requires huge amounts for tax purposes.

A society has to open a separate bank account inorder to do its day to day transactions with its own name.