Help with forms and functions please!

Help with forms and functions please!

I am trying very hard to figure out Zoho but I have a quick question.  My website is similar to ebay in that it connects buyers and sellers.  I would like potential buyers to be able to fill out the Zoho form on the website and have that form generate an email to my seller.  I created two applications  - The first application houses my customer contact information including Email, Name, Phone, etc.  The other application is a form that will be embedded on my website.  Here's what I want to happen:
 
The buyer fills out the form with a particular item # (ex.  PR01)
Sellers in the contacts application are all coded with letters such as "PR"
The form recognizes the "PR" in the buyer request and triggers an email to the seller coded with "PR" in my contact application
 
 
Is this possible?  Does anyone have any experience setting up a similar system?  I am guessing I would need a specific function written to accomplish this type of transaction.
 
Help is appreciated!!!