you can configure DHCP server as xu said.
about Nat ,you can configure static one to one nat such as :
static outside 10.64.146.124 inside 113.1.1.5 out-interface gigabit-ethernet 0
or you can configure Multi-to-one address translation based on ACL.such as :
access-group acl1 global pool song out-interface gigabit-ethernet 0
you should configure acl1 ,and ip nat pool first.
more detail please refer "Aruba Mesh Router CLI Configuration Guide"