I need to email script to my users when they checkout from my site.

 
HI there.

i am building a site similar to www.ineedhits.com, i want to be able to send scripts to my users after they checkout from my shopping cart.
I am putting on here what products need to go with what scripts. I have to build the scripts and test them out. I don't know how to do the script thing. I'm hoping that an expert here could help me out .

Products

Code Optimization $39.95 - Once my customer buys, then they enter the url of their website and it email them a finished report. The script for this should run like this one:

http://online.htmlvalidator.com/php/onlinevallite.php 



Keyword Analysis $39.95 - If customers want to order a keyword analysis, then after they pay it should email them a finsihed report. The script for this should run like this one:

http://www.ranks.nl/cgi-bin/ranksnl/spider/spider.cgi?lang= 



Relax and Submit $2- If customers want to order the two dollar relax and submit, then after they pay it should email them a finished report. The script for this should run like this one:

http://www.cspltd.ndirect.co.uk/submission/



Metatag Creator FREE - If customers want to order the metatag creator then they add it cart and still check out normally. However, they are charged zero but still offered my other products at checkout. Hey would like to do a keyword analysis, etc, etc. The script for this should run like this one:

http://www.creatingonline.com/site_promotion/metatag_generator.htm 


That's it,
thanks