Subnetting Network help

How do I find the host bits per subnet and useable hosts per subnet? I'm pretty sure the rest is correct, all we were given was the Host IP Address and Subnet Mask.

Host Ip Address 172.30.1.30

Subnet Mask 255.255.255.0

Subnet Bits 8

# of subnets 254

Number of host bits per subnet ???

Number of useable hosts per subnet ??????

subnet address for this Ip address : 172.30.1.0

Ip Address of first host on this subnet 172.30.1.1

ip address of last host on this subnet 172.30.1.254

Broadcast address for this subnet 172.30.1.255