1) Use the links like www . yoursite . com/redirect_folder/1stcasino.php?id=123 where id or other parameter can be used for tracking if you have a small number of “compaigns” to track.
2) in robots.txt prohibit redirect_folder from indexing.
3) the simplest 1stcasino.php script should redirect to the casino/aff. website like this:
$rdurl=”Location: http://www.casino_website.com/?your_aff_id”;
header($rdurl);
plus you can add extra params to the redirect link in the script