Need Helps!! I'm useless

[PandaFi]

Hi, I don't know the first thing about coding, and need some help. I need to design a page in php that would be a simple form where the user inputs their email address into a box, with a submit button.
After submitting the email address however, I need a few things to happen:
1. Process the form data
2. Validate the E-mail address
3. Check to see if the email address is already been inputted
4. If not then continue
5. I then need to send a code from my "code table" (i have the codes in a database thingy) to their email address automatically.

This is for an online psychology experiment with two conditions (two sets of codes) and I need to alternate between these conditions when codes are sent out. Can anyone help. I had someone from uni design the rest of the site for me, but now they won't help me do this bit. How would I go about doing this sort of thing? Hope it all makes sense!!! Thanks

[TheDefender]

HotScripts surely has something that can do all of those very tasks for you. Also, you could try searching this forum because these are pretty basic principles that have been discussed on numerous occasions.

When you have some code in hand, and need help tweaking it, then come on back and we'll help you out. You're going to be hard-pressed to find someone who will just "give" you the code...

Keywords: form validation, email validation, send email, query database