Setup Wireless router as new dhcp server

Hi,
I did not know where to post this so i posted it here
I have a mikrotik as my main router with dhcp disabled and i connect laptops and desktop pc to it via LAN and this configuration :
Ip: 192.168.100.xxx
Sub : 255.255.255.0
Gateway : 192.168.100.4 (mikrotik ip)

So i want to connect a wireless router to this network and set it up as new dhcp server and a new pool (eg.: 192.168.0.xxx) but the problem is that i dont know how to setup internet in my router

I know i can disable dhcp and use it as an access point but i need the dhcp since i cant setup ip for each device

How can i achieve this ?

Tanq