no
no
no
Yes
You dont
no not yet
no it is a feature phone or a messaging phone
There is no way to do so to my knowledge.
Samsung Brightside, Samsung Reality, Pantech Hotshot and a few others
go to ypur contacts and go to edit and click on the 'message tone' and choose which one you want
Facetime is owned by Apple, so there is probably no way you will ever get it on your Samsung, esspecially after Apple sued Samsung.
There's a number of 3rd party keyboards that have emoji support on Google Play. You can download one of those and should work with Snapchat.