In order to begin your AEM Development locally, you will need to get your copy of AEM + License.
Prior to that install:
brew install maven
Place it in the folder called (e.g. Author), and then double click on the jar file, and it will start and cry-quickstart folder will be generated. On the first start it will take some time, but the following starts will be much faster.
I am running this on my Mac
Some useful Urls that you will need:
To access your AEM CRX Package Manager
Will land you on the Admin Home Page
Will allow you access CRXDE Lite