Open Terminal
Step 1: 
curl -sS | php
Step 2:

mv composer.phar /usr/local/bin/composer

Step 3:
 cd /Applications/MAMP/htdocs
Step 4:
composer create-project laravel/laravel laravel5
Note: laravel5 is the project name in htdocs. U can specify any name u want to give to your project
Step5: Php artisan serve

Then open the url in browser. See the path like or localhost and enter the url. The default view will load.