installing mamp is pretty strait forward, download the installer form here:
if you are familiar with XAMPP on windows, it's not really that different.
in XAMPP, it would create the site root as:
which mapped to the site address:
for each DW site you would create a subfolder of:
and adjust the web URL appropriatly:
Same strategey applies with MAMP, the only difference is where the htdocs folder gets created.
in MAMP, the htdocs folder gets treated at:
create the subfolder for the site there:
and the same web URL will link to it: