how do i get apps on my macbook air like i have on my iphone

Look in the Mac App Store, you can buy all you need there.

https://discussions.apple.com/thread/3695678

Apps that run on the iPhone don't run on a Mac, and vice versa.

There may be similar apps for both platforms. You can find apps for the Mac on the Mac App Store (Apple Menu), or search MacUpdate or CNET.