wordpress multisite subdomain problem

hey guys I'm in trouble seriously. I'm running wordpress site and I'd like to have multisite subdomains not subcategories f.e.
(I've created subdirectory in ftp.)

oranges.domain.com
not domain.com/oranges ..actually I can access subdomain but only in this format: oranges.domain.com/domains/domain.com

And also if my wordpress has root in subdirectory like domain.com/home how can I redirect domain.com to go to domain.com/home because not everybody will know that my domain is accessible only with subcategory.

Here are the codes I got in config and htaccess-
I'd be really glad if you guys can help me.

# BEGIN WordPress
RewriteEngine On
RewriteBase /domains/domainname.com/home/
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?siteN/files/(.+) wp-content/blogs.dir/N/files/$2 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]
# END WordPress

define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
$base = '/domains/domainname.com/';
define('DOMAIN_CURRENT_SITE', 'domainname.com');
define('PATH_CURRENT_SITE', '/domains/domainname.com/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

well thanks man ..