Question 3 and 4 could be done at the same time.
Rack1SW2#show interfaces trunk
Rack1SW2#
Rack1SW2(config)#int port-channel 1
Rack1SW2(config-if)#switchport trunk encapsulation isl
Rack1SW2(config-if)#switchport mode trunk
Verify that the trunk is up:
Rack1SW2#show inter trunk
Port Mode Encapsulation Status Native vlan
Po1 on isl trunking 1
