Is it possible with upload a file AND submit text in a single form?
Yes, it's possible. Just make sure you set the form enctype="multipart/form-data" and that you use type="file" for file input and regular inputs (type="text", etc) for texts.
You'll need to write a code to move uploaded files to a location you want, as well as to add its info to the database.
Yes, it should be possible.
Just ensure that your <form> has the attributes enctype="multipart/form-data" and method="post"
By PHP side after submit, you can use $_POST variables as usual, plus $_FILES for handling uploads with <input type="file"> in the same form.
See this PHP manual page for details on file upload.