Questions about Premiun and V Premium.

Hi, I've played G era vanguard since High school then I quit after that. I already read some explanation posts about it, but I'm still a bit confused.

Premium questions: So there is no more G only deck, they changed it to Premium and you can put whatever you want in the deck like V cards, D cards, orders and ride deck? What does the stride in set VSS-... and D-PS... mean? Are they a support for this format?

V-Premium questions: Also there's no V only either? Is this the format that you can put everything from G to V? Does D-VS... is the name of a support?

Thank you.