2D Characters and sprites on a 3D level/map

I want to make a game with a similar art style to party hard 2 but I am extremely new to the unity engine and have no clue what I need to do to reach that, I was just wondering if there’s any tips, tools or certain code that can help me to create it, thanks.

@Cherno so are you saying that an art style like this alt text

is unachievable on the unity engine, also are you saying that all the graphics would not be able for me to make on the 2D preset. Plus could you explain how 2D creates terrible performance. Sorry just want to learn everything about this topic before I make up my mind.