Make the router act as a switch (for both lan and wlan)

Hi everybody.
I’ve just bought this new router and started to play around a bit with it.
Since now, i’ve managed to set up the wireless interface but i can’t go further…

What i need is a setup that basically, makes my router act as a switch (so that every clients that connects to it can send and receive data from each other).

I kinda understand that i have to create a gateway and setup dynamic routing, but i’m not sure about it either.

And also i don’t understand if it’s possible to give the router a unique ip (eg: entering ftp server/winbox from any interface using a single ip)

Well… any help would be appreciated

Thanks in advace
Umberto

If you want router to act as a switch, then simply create bridge and add wireless and ethernet interfaces to bridge ports. No routing is required.