Webflow with own mysql database and php for export

I need help.
Namely, I have created a homepage with forms. And I would like to be able to use them even after the export without a third party. I also have my own database. I already know how to do it, but I do not have the knowledge. I do not know what to write to php because of the effects such as “Successfully sent” …
Is it possible, if someone already has it to send me?