Modem -> Router ->Computer

Hi, I have a DSL modem with 1 ethernet port, 1 USB port, and a wireless router. I'm pretty sure that it can't act as a router between ethernet, USB, and wireless, but just between wireless nodes. I also have a router lying around with 4 LAN ports and 1 WAN port; it is currently not in use.

This is my current configuration:

..................................->USB.........->Comp 1
Internet -> DSL Modem ->Ethernet...->Comp 2
..................................->Wireless...->Comp 3

Therefore, none of the computers are connected to each other through a LAN. However, I want them to be able to share data quickly and a printer. So would it be possible to connect the DSL modem to the router by connecting the Ethernet port of the DSL modem to the WAN port of the router and then connect the computers to the router? Also, would it affect the speed of the internet connection?
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More about modem router computer
  1. You could pretty much do that, but what throws me off is why they computers are not already in a LAN. I used to have a similar setup and it worked. Your idea sounds good though.
  2. But will it hurt my internet speed since all data goes through the ethernet port in the modem?
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