For details of how to connect your kit, you’re best bet is to look at the connection guide:
https://www.music-line.biz/cms/fileadmin/pdf/man_naim_connections_e.pdf
To connect the NAC112 to the NAP150, you will need a SNAIC 4. To connect the CD5 to the NAc112, you will need a standard grey Naim interconnect. Hopefully you have the link plugs for the NAC112 and the CD5. If not you will need them too. Have a read through here:
https://community.naimaudio.com/t/how-to-identify-snaics-and-interconnects/74/2
You will need some suitable speaker cable, suitably terminated with Naim SA8 speaker plugs at the amp end. NACA5 would be my recommendation - at least 3.5m per channel. Have a further read here;
Read through the FAQs and also through the manuals thoroughly. Does the CD5 come with its clamp? If not, you’ll need one of those as well. Any remote control included? If not you’ll need a Narcom…
Oh, and you’ll need some speakers too…