Links for most Store Guides and other documentation are HERE
I’m not sure where you are getting the term Pre-registration from the only things I can think of are:
You should register in the seller portal and be approved before uploading you games. Registration is very simple, being a commercial seller is simple but there are some catches like your name has to be the same on the application as it is on the ID you present. So if your ID has 4 names, you need to put 4 names in that same order but on two lines, Ron Dan Bill Smith needs to be entered as Ron Dan then Bill Smith on the second line.
The other thing I think you might be thinking of is Pre-Certified and that is only available to sellers with a Samsung Store business partner and those are usually top sellers on Play Store.
If you can clarify this a bit better I can work with you to get an answer.
Samsung Developer Relations