That’s the argument in favour of a powered hub right there. Your computer won’t necessarily be able to power everything from the single uplink port.
Just use any good Anker USB-3 hub and a USB-C to USB-A (3.0 or better) adapter. They are cheap. No need for a USB-C uplink at all.
Afaik there are no “hubs” short of expensive docks (OWC, Belkin, and Caldigit make decent ones) that have as many ports as you want plus HDMI and a USB-C uplink. C series hubs tend to have three ports and HDMI or four ports without, because the HDMI takes up the last port on the chipset. So if cost matters, get a standard hub and adapter, and if cost doesn’t matter go for a proper Thunderbolt dock to take full advantage of the throughput on your Air.