Any recommendations on good setup for preparing for RHSCA

I'm a long time Linux user but I'm finally going to try to level up. I've got the Michael Jang book and it looks like his sort of lab setup is this so perhaps I should try to mimic this for my setup. I'm not sure what combination of services here at Linode would do this in a cost effective yet useful way? Right now I've got the $10/month account.

Anyway, Michael Jang recommends you have these roles:

Server1 - server1.example.com on the 192.168.122.0/24 network. The book assumes a fixed IP. He uses a specific one in examples but of course I'd use whatever's assigned by Linode. He assumes a fixed IP of 192.168.122.50. Of course, I fill in the blanks with whatever Linode assigns me he just uses those for example purposes.

Tester1 Secure shell server that supports remote access, configured as tester1.example.com on the 192.168.122.0/24 network. Book assumes fixed IP of 192.168.122.150

Outsider1 - Workstation on a third IP address, configured on as outsider1.example.com. Some services should not be accessible for that workstation. The book assumes a fixed IP address of 192.168.100.100.

I use OS X so presumably this Outsider1 machine would be on virtualbox or something?

Any advice at all on the optimal setup or anything else regarding prep for RHCSA would be greatly appreciated. Thank you!