What steps would you take to subnet a network?

Once you have the subnet mask you can figure out the amount of usable hosts and from there you can set up your host ranges and broadcast IDs

Given a subnet network address, how would you determine...

1. The broadcast address?

You find the broadcast address by adding +1 to the end of the host ID range

2. The range of usable IP addresses?

The range of the usable IP address you add +1 to the end of the network ID and then go up by your number of usable hosts.