mod rewrite question

Ok, I have a mod_rewrite that someone did for me.

Right now, if anyone hits website.com/mynamehere/
And if it doesn't exist, it sends them to
/control.php?reseller=mynamehere

I need it to instead behave like:
website.com/a/mynamehere go to website.com/credit/?aff=mynamehere

I'm just adding a subdirectory, and sending to a different page.  But my regex'n skills don't exist.

RewriteEngine on
       # is not a directory
       RewriteCond /www/wse/$1/ !-d
       # the A-Z is being caught by the NC flag (compiles the regEx case-intensive)
       RewriteRule ^/([a-z0-9_-]+)/$ /$1 [NC,R=301,L]
 
       # is not a directory
       RewriteCond /www/wse/$1/ !-d
       # the A-Z is being caught by the NC flag (compiles the regEx case-intensive)
       RewriteRule ^/([a-z0-9_-]+)$ /control.php?reseller=$1 [NC,L]

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