Ok my knowledge is limited but what I'd do is create a new page with blurb similar to:
register for our news letters here and for special offers etc etc.
then create a button linking to the page users_registration.php.
That will allow new people to register.
As to moving the records take a look at this
there are loads of links on google on how to do this. depends on how many records you have. Might just be quicker to input my hand or export to say excell and then import.
I've not done it using mysql but it can be done.