Pure Arch isn't going to give you what you want. EndeavourOS is probably a better option. Nice installer, a relatively kind and helpful community on their forums, and you can use the Arch wiki to fill in the gaps.
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This one is great
Really great guide! That site has lots of useful tips. They're kept very current and there's no paywall or ads either.
For your Arch with Cinnamon install, I also recommend this guide.
But why? Sorry if that is a vague question. Of it ain't broke...
Not aware of any guides, but I know that in order to get the terminal to look like Manjaro's, you will need to install the zsh shell with the powerlevel10k theme and zsh-syntax-highlighting. I believe they also use either zsh-autocomplete or zsh-autosuggestions.
At least, this was how it was configured back when I used Manjaro several years ago.