Does my Wix premium Plan give me access to wix studio editor?
Wix Studio is open to everyone to build a new site, or to update an Editor X site to Studio. But if you are asking about being able to convert a Wix Classic site to Studio then no, that can’t be done.
Just double checking if by having a premium plan and making my site again in Wix studio i have to pay anything else besides my normal Wix plan
If you rebuild your site in Studio then you should be able to transfer your Wix Classic Premium plan as credit over to the new Studio site, but there will be a price difference as Studio plans are more expensive. Note that dashboard data such as contacts etc cannot be transferred to the new built site.