Configuring IP addresses Project Help

So I am doing a packet tracer project, but I'm having trouble assigning IP addresses. I'm kind of lost on if I am doing it right.

Basically, the instructions require "you have been given the 192.168.1.0/24 address space internally, and the Internet Service Provider has given you 1.1.1.1/24 for the WAN connection; Subnetting must be used. 192.168.1.0/24 & 3 subnets for 16 hosts per network"

Now this is how I understood it, feel free to correct if wrong.
So for the 3 switches involved in the project, each would feature
1. 192.168.1.24
2. 192.168.1.48
3. 192.168.1.72

And each of the three pcs connected to each switches would feature ip address in between 192.168.1. 24 and 192.168.1.72 ranges. The subnets for each pc would be 255.255.255.0

I really need an answer today, and thanks for the help.