I have my DHCP and DNS. I need wireless.

In my LAN, there is a domain controller which also acts as a DNS server and DHCP server.

And only thing that I need is wi-fi. I have a good router. What do I do with that?

If I set it up and disable DHCP on that, it gets an ip 192.168.0.1. But all the devices in my network have 10.0.0.x

How do I fix it?

Enter the web setup of the router and change its local IP to something else in your range. Disable DHCP in it and point everyone to use your server instead. You may need to use the 192.168.0.1 IP once for changing this parameter, then use whatever IP you put in it.