No, you don't need a sound card as it has on-board audio.
If you connect your PC to the modem/router via an Ethernet cable, then no, you do not need a wireless adapter.
No, you don't need a sound card as it has on-board audio.
If you connect your PC to the modem/router via an Ethernet cable, then no, you do not need a wireless adapter.
No, you don't need a sound card as it has on-board audio.
If you connect your PC to the modem/router via an Ethernet cable, then no, you do not need a wireless adapter.