Hello and welcome to the Forum!
Basically, Manjaro uses zsh not bash.
Funny enough, I asked the same question a while ago.
Along with zsh I would recommend you install p10k too, it makes customization much easier.
This is my setup:
Finally, to get the icons, you need to use a nerd font. The font I use is MesloLGS Nerd Font.
I hope this helps.
PS: After you install p10k, run this command to start customization:
p10k configure