New Thread and database

[Murtific]

Where is the parts of the code in newthread.php that calls the newthread function to save data into the database. I want to make my own input field and save it to the thread database where i have my own fields when I click on POST A Thread.

or

Does anybody have any suggestions about how to have it submit the new thread and instead of it redirecting you to the new thread, it redirects you to a custom template i have where I can recall the new thread and then insert the data into the database this way. I'd rather do the first way, but i'm clueless about how that part completely functions.