If your Macbook Pro has a DVD/CD drive just insert the game CD in the drive and follow the directions. If you do not have a DVD/CD drive you will need to copy the game to a flash drive or use an external DVD/CD drive to install it. Of course the game will have to be Mac compatible or it will not run on a Mac.
No.
MacBook Pro is the best you can get
Click the link I will post to Crucial. They will scan your MacBook and tell you exactly what ram and how much you can install.
The latest 15 inch MacBook Pro will support up to 4GB and the 17 inch version will support up to 8 GB of RAM.
MacBook Pro!
The macbook pro!
Yes, you can install Steam on a MacBook Pro. Steam offers a macOS version of its client, which allows you to download and play a wide variety of games compatible with macOS. Simply visit the Steam website, download the macOS client, and follow the installation instructions. Keep in mind that not all games available on Steam are compatible with macOS.
No.
you probably should get the MacBook. they are cheaper than the MacBook Pro. now, if you want a bigger screen, then get a MacBook Pro.
There is no age limit for getting a MacBook Pro.
If you can play Minecraft then you can install the Too Many Items mod.
The hard drive should install and format just fine. However, if you're looking to use the pre-installed Mac OS X and software from the newer MacBook Pro on the older MacBook, it probably won't work well, if at all.