I want to create Vlan and setup a network which doesn't create problem for us

Hello Everyone,

I hope everyone is fine and i have some problem, a little doubtful and confused about the following IT Infrasture, so i need your kind cooperation in this regards and the Items are as the following below! 

2. ip phones,

1 atm machines,

2 self-checking machine,

4 cashier machine,

2 dell servers  which has windows server 2016 installed

20 laptops and desktops which have windows 7 and windows 10 machine, 

2 internet connection,

1 sonicwall

1 Cisco Wireless Router

1 Eero Wireless

2 dell emc networking n1148 switches

2 poe switches for ip cameras

So in this case what's your recommendation, suggestion or instruction for me to do so without any problem (ip conflict, looping and etc).

I am looking forward to see the response in this regards as soon as you can and your kind cooperation will be highly appreciated.

Have a wonderful weekend and Thanks  a lot