drivers - I just installed Ubuntu 14 for the first time and cannot get the wireless to work

I just installed Ubuntu 14 on my laptop for the first time. After the installation I had no Wi-Fi connection. I went to "Edit Connections" and created a "Wi-Fi Connection", but don't know how to answer the questions such as SSID, Mode, BSSID, Device MAC address, Cloned MAC address, and MTU.

Can one of you gurus please help me?

Many thanks in advance and have a nice day.

Regards,
Majid Chavoshi

Thanks for your assistance, below please find the output of lspci -knn | grep Net -A2

$ lspci -knn | grep Net -A2
00:19.0 Ethernet controller [0200]: Intel Corporation 82567LM Gigabit Network         Connection [8086:10fs] (rev 03)
Subsystem: Dell Device [1028:024f]
Kernel driver in use: e1000e

oc:oo.o Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]
Kernel driver in use: b43-pci-bridge