[Solved] Connecting the UPC Connect Box and distributing the network to the sockets in th

Good morning,

Thank you very much for joining the group. I immediately point out that I am not a specialist in home networks as you will see soon ...

I would like to ask you for help in resolving the following issue. I have distributed and connected cabling to the Ethernet sockets in the apartment (2 sockets in each room) and I have a UPC TV and internet provider who provided me with:
1. Room 1: mediabox (only TV signal) and Connect Box (Internet + WiFi) 120Mbps
2. Room 2: Horizon - only TV signal

I would like to connect cables to have internet in every outlet and be able to connect Smart TV and WD My Cloud from room 2 (at the moment the TV is connected to the WiFi network but I would like to have it in a cable and additionally use WD My Cloud from anywhere). I also have an old D-Link 615 router at home, which I could possibly use or buy something that is necessary ...
I read a little and what I understand is as follows:

1. I should "transfer" the interenet from UPC Connect Box to the box in the hall - for this I connected the Ethernet cable to socket no. 1
2. install router or switch in the box and connecting the interent from socket 1 to the socket of my router / switch to the Ethernet or LAN input?
3. Can I use my router - is it suitable?
4. WiFi can stay from the original source because the range is everywhere approx

Please find attached the freehand drawing of what it looks like (my network connections are blue ) - can someone advise how to connect it, what to buy and how to configure?

Thank you for your help!

Why connect 2 cables to a switch from a connect box? Just buy a switch with the expected number of sockets, preferably gigabit.

Thanks for the answer. I understand that I put the switch in the box in the hall and connect to the switch ibternet flipped from room 1 and then from the switch connect to all the inputs in the box.

Or maybe someone recommend a switch so that it has 10 outputs, which means that I can distribute the signal to all sockets in the apartment.

Thank you!

If you are going to play movies, e.g. from a network drive on TV, you could use a gigabit switch.
The cheapest I've found is (larger than 8 ports and smaller than 16 are missing)
Switch D-Link GO-SW-16G 16x RJ-45 10/100/1000
https://allegro.pl/switch-d-link-go-sw-16g-16x-rj-45-10-100-1000-i7295292257.html#thumb/1

Alternatively, if you want to connect what you have, you only need 8 ports
for example.
Switch TP-Link TL-SG1008D 8x10 / 100 / 1000M
https://allegro.pl/switch-tp-link-tl-sg1008d-8x10-100-1000m-i7477514532.html

You plug the cable from this connectbox into port 1 on the switch and the rest of the sockets into the other ports and that's it.

Thanks - a solution put into practice.