In short, this is the message after running dhclient.
...
No DHCPOFFERS received.
No working leases in persistent database - sleeping

What I have done:
cat /etc/network/interfaces // to get interface
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto ath0
iface ath0 inet dhcp

auto wlan0
iface wlan0 inet dhcp

I used wicd manager and it tells me "This network requires encryption to be enable.d" Is the encryption sshd?

Questions:
How am I supposed to get my Internet connection up?

Where am I supposed to enter the password for my access point?

What is the difference between ath0 and wlan0? Are they both wireless?

How am I supposed to know what the nameserver is supposed to be?