URL Rewriting

Hi,

I'm just trying to clean up the URL's on the blog section of a site, having always used Wordpress in the past I'm not used to having to do .htaccess rewrites to clean them up and I'm having some trouble getting them to work.

I've successfully got the posts and the post preview working, so used that as a base to try and sort out sections, archives (month and year), authors and tags. My .htaccess looks like this:

<IfModule mod_rewrite.c>  
    RewriteEngine on  

    RewriteRule ^blog/([a-zA-Z0-9-/]+)/preview$ /blog/post.php?s=$1&preview=all [L]
    RewriteRule ^blog/([a-zA-Z0-9-/]+)$ /blog/post.php?s=$1 [L]
    RewriteRule ^blog/tag/([a-zA-Z0-9-/]+)$ /blog/archive.php?tag=$1 [L]
    RewriteRule ^blog/section/([a-zA-Z0-9-/]+)$ /blog/section.php?s=$1 [L]
    RewriteRule ^blog/archive/([a-zA-Z0-9-/]+)$ /blog/archive.php?year=$1 [L]
    RewriteRule ^blog/author/([a-zA-Z0-9-/]+)$ /blog/archive.php?author=$1 [L]

</IfModule>

The debug on a section page is this:

Debug Message
SELECT * FROM perch2_pages WHERE pagePath='/blog/section.php' LIMIT 1
SELECT DISTINCT settingID, settingValue FROM perch2_settings WHERE userID=0
SELECT * FROM perch2_pages WHERE pageNew=0 AND pageHidden=0 AND pageDepth >=0 AND pageDepth<=1 ORDER BY pageTreePosition ASC
SELECT pageTreePosition FROM perch2_pages WHERE pagePath='/blog/section.php' LIMIT 1
Using template: /templates/navigation/item.html
Fetching from cache: perch_blog_sectiona74d480eff88a50c212194b2ddc34d05
SELECT * FROM perch2_blog_sections WHERE sectionSlug='big-house' LIMIT 1
SELECT SQL_CALC_FOUND_ROWS DISTINCT tbl.* FROM ( SELECT idx.itemID, main.*, idx2.indexValue as sortval FROM perch2_blog_index idx JOIN perch2_blog_posts main ON idx.itemID=main.postID AND idx.itemKey='postID' JOIN perch2_blog_index idx2 ON idx.itemID=idx2.itemID AND idx.itemKey='postID' AND idx2.indexKey='_id' WHERE 1=1 AND idx.itemID=idx2.itemID AND idx.itemKey=idx2.itemKey GROUP BY idx.itemID ) as tbl WHERE ( sectionID='4' AND postStatus='Published' AND postDateTime<='2015-06-16 17:30:00' ) GROUP BY itemID ORDER BY sortval ASC LIMIT 0, 10
SELECT FOUND_ROWS() AS `count`
Using template: /templates/blog/post_in_list.html
SELECT * FROM perch2_blog_sections ORDER BY sectionTitle ASC
Fetching from cache: perch_blog_tagsd1e331b756606ce55e1d3d497f301479
Cache file not found: perch_blog_tagsd1e331b756606ce55e1d3d497f301479
SELECT * FROM perch2_blog_sections WHERE sectionSlug='big-house' LIMIT 1
SELECT t.tagTitle, t.tagSlug, COUNT(p2t.postID) AS qty FROM perch2_blog_tags t, perch2_blog_posts_to_tags p2t, perch2_blog_posts p WHERE p2t.tagID=t.tagID AND p2t.postID=p.postID AND p.postStatus='Published' AND p.postDateTime<='2015-06-16 17:30:00' AND p.sectionID=4 GROUP BY t.tagID ORDER BY t.tagTitle ASC
Using template: /templates/blog/tag_link.html
Fetching from cache: perch_blog_date_archive_yearsd724844c2fb9855d33fc20a670fcb457

I'd appreciate any help please.