Installing Arabic Wordpress & Arabic Themes
wp-config.phpfile, I've modified it just as I used to do with English installation, but got some weird errors, I suppose it's because there are explanations written in Arabic in it, I didn't try to remove them, instead I just replaced the file with
wp-config.phpof a English package & it worked.
Only if you got errors like I did & chose my solution, you should look at these inststructions in the
// Change this to localize WordPress. A corresponding MO file for the
// chosen language must be installed to wp-content/languages.
// For example, install de.mo to wp-content/languages and set WPLANG to 'de'
// to enable German language support.
define ('WPLANG', '');
As your WP is already Arabic, you don't need the MO file mentioned, it's already included, but you should enable Arabic changing
define ('WPLANG', '')to
define ('WPLANG', 'ar').
Once the Blog installed, I went looking for some Arabic themes & found out a tool to convert regular Left to Right Wordpress themes into Right to Left, the web tool just converts the theme's CSS sheet in one second: it changes text alignment & the position of columns, the tool is CSS Mirror by Ahmed Al-Hachimi.
Honestly it didn't help much with the theme I worked on, I got to change the CSS sheet manually, I guess it would save you time if you use it then fix stuff, maybe it depends on the theme you want to edit.