I wouldn't really focus too much on the Vienna at 1500. I would just watch some YouTube videos about it. You can also play some games in the Vienna.
Vienna book?

The Vienna is a great opening. As for books, check out this past discussion:
https://www.chess.com/forum/view/chess-openings/vienna-game-20

many books and other resources on Vienna Game provided here...
Introduction To The Vienna Game & Gambit...
https://www.chess.com/blog/RussBell/introduction-to-the-vienna-game-gambit

I've been wanting to delve more into the theory of the Vienna game and stuff like that but the resources on the Vienna are so scarce from what I've found (my book only has like 4 lines for the Vienna gambit). Does anyone have any books in mind that can go more into the small details and more lines or do I have to get a course for that?
The Vienna Game and the Vienna Gambit are different things. The Vienna Game refers to lines where white doesn't play 3. f4.
Try to get hold of the 1980s Batsford book. It covers both. It won't have changed much because it's been out of fashion.
Yes yes, but the Vienna Gambit derives from the Vienna game so I put it all in one thing. Thank you for the link though

Long live the Vienna !
https://www.youtube.com/watch?v=rRwd94jQmCE
I've been wanting to delve more into the theory of the Vienna game and stuff like that but the resources on the Vienna are so scarce from what I've found (my book only has like 4 lines for the Vienna gambit). Does anyone have any books in mind that can go more into the small details and more lines or do I have to get a course for that?