Computer Help and Support

You should need only the one box, as stated above, compatible with the cable company’s list.

The USB printer, if ONLY USB, will need to plug into either that cablebox/router/hotspot box (see the docs for the unit you plan to buy, if you can plug a USB printer into it!) or some other (first steps first). Most printers do have wireless capability, a pain in the ass to type in the wireless password, because they only have numeric keypads at best. If so, no wires are needed to anything (but power).

I personally use ethernet with as many devices as possible. Fastest, dead reliable, and always works with no setup (DHCP protocol just works).

Your old DSL modem probably has no ability to connect to cable. That’s why they call it a DSL modem.

Good luck.