My advice would be look up The Missing Semester it’s a free online MIT course on how to use the terminal and it will govern you a better understanding of how to use it and Linux more generally. Really helpful to find your way around and give you an intuitive sense of what you’re trying to achieve.
Then beyond that installing arch is easy with archinstall but it’s probably more helpful to learn about the components of desktop Linux and what they do so that you actually know what you’re doing.
Well the way to avoid dust is to not have any soft furnishings including carpets and rugs because they shed fibres that form dust, not have any clothing, because that also sheds fibres and forms dust, not have any skin because that sheds and forms dust, also have no hair, pets, unsealed surfaces, open windows, wear outside shoes inside, etc etc…
But if the above sounds too tricky then yeah the alternative is you just have to vacuum, mop and clean. I hoover several times a week, my partner dusts roughly weekly. It sucks. Entropy is a cruel mistress. But the upside is, having less dust in the house a) looks cleaner, b) is better for your respiratory system. So it’s worth doing, especially if you have someone in the house with something like asthma that would make them more sensitive.