Downloaded MAMP from living-e the recommended development environment for Mac, Apache, MySQL and PHP. Max OSX comes with Apache and PHP but it could be troublesome messing around with configuration. MAMP installed as an application in OSX with everything you need.
Got also the latest 2.2.1 from here I quickly have a blog running in localhost.
MAMP doesn’t start automatically upon starting of OSX so the MAMP Control widget can be installed in Dashboard for easy access to Apache and MySQL server.
Next would be finding a good text editor.