Hi Rene,
I've installed a Xampp server on my OS X 10.7.4 (and also on my Windows 7) with a Standard Moodle Package installed on it and find it really easy to use though I'm not a techie person. I copy the online course to my local site and then I create and experiment on new stuff locally and when it's OK add it to my online live site. I either just upload zipped files, or I make a backup of the local site with just the new stuff and then add it to the online course being careful to use Restore with the "Current course, adding data to it" option. I'm also careful to keep the online and the local sites identical.
Not sure if the above is going to make sense to you.
Cheers,
Glenys