i read the sticky above, but dont not sure if it can hold 30 users even as an AP.
each, the router and the AP, will support about 15 users
and another thing, if i disable dhcp , ill have to set ip manually right?
NO since the AP is connected to the main router LAN port to LAN port via the network cable, the main router will provide the IPs. The AP will act like a wireless switch.
Just make sure that the LAN IP of the AP is of the same IP scheme then the main router