Home Network/Router - Connecting 2 routers?
 

I have a wireless router on the ground floor of the house. However, I want to connect some of my PC to the router wired. (They are in 2/F)

The builder already pre-routed the cabling required to each rooms on the ground floor and 2nd floor, but everything stem from the basement.
Right now, I routed the network cable from the router (G/F) to the basement, and back up to a room on the 2/F.
However, I can only connect 1 PC this way, and I want to do the same to 3 PC.

What's the best way to do it?
I am thinking of putting another router down in the basement, so I have the modem+wireless router on the G/F, connected by wire to the basement router, and connect that to 3 rooms/PC on the 2/F.
However, I am not sure how connecting 2 routers in series would work. Do i need to set it up specifically? or do i simply connect the LAN of the 1st router to the Internet/WAN of the 2nd router?

Connect LAN port of 1st router to LAN port of 2nd router. Disable DHCP on 2nd router. Unless you want the 2nd router to act as a second wireless access point, you can just use a switch instead. Would be a lot simpler.