Yes, Samsung Metro XL does have Bluetooth.
Yes, Metro XL does support the Tamil fonts and language.
You can store up to 1000 contacts in Metro XL. In addition, you can store up to 250 contacts in each of your sim card. So, if you are using 2 sim cards, in total you can store up to 1500 contacts.
Yes, Samsung Metro XL supports the Hindi language.
Yes, Samsung Metro XL does have music player.