Here are some sample commands:
snmp-server host [snmp mgr ip]
snmp-server enable traps envmon
snmp-server enable traps bgp
snmp-server enable traps entity
Here are some useful but optional commands:
snmp-server ifindex persist
snmp-server trap-source Loopback0
snmp-server location Data Center
snmp-server chassis-id FTX0123456
snmp-server community YOUCOMM RO
There are other options as well and you can find them in the IOS configuration guides.
Hope that helps.