No you cannot. AT&T uses a GSM network and Boost uses iDEN and the two are not even remotely compatible. The Boost SIM card can be used for international roaming but it will not work with GSM networks in the US. It will not work either way, a Boost SIM will not work in a GSM device and a GSM SIM will not work in a Boost device.
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Try checking underneath the battery. It may have one. However if you have Verizon then chances are you won't have a sim card on this particular phone.
buy a new Sim card or consult a local mobile phone store
No
The only way of getting music on your phone to my knowledge is bluetooth from another device or using a USB lead to copy them from a computer. I don't think there is a direct way using the SIM card, sorry.
The back-end system of a SIM card is likely to begin in a GSM network system. On one end their is an operator manned back-end system, and at the other is the SIM card.