Apple ID in Bangladesh

Start here: Create and start using an Apple ID - Apple Support

Are you in the process of opening an account and have found your details declined? First check the type of card you want to use. If it is a debit card it may well be unacceptable,

Unfortunately there isn't currently an iTunes Store in Bangladesh, until if/when Apple open one there (we are fellow users, we won't know when that might be) you won't be able to buy/download iTunes store content (you can't put a different country on your account, being in a country is part of the store's terms).

If using for creat I'd then we need to add other countries name instead of Bang

You have to be in a country to use its store, Apple can (and do) permanently disable accounts