Switch port to system

Hi,

I have rcently joined a company and we want to migrate our network to 10.0.0.0 ip address range from 192.168.0.0.

Also we want to configure few vlan's

But the major challenge I am facing is that there is no documentation available for wiring. How can i track which port of which switch is going to which system.

We are using Dell 5548 and 6248

Please help me.