DMZ setup and wireless access to it

Here is my basic setup:

I have a WAN port to my ISP; my ISP is DHCP.
My LAN is 192.168.5.0/24; I have a separate AP in that subnet.

What I want is two-folds:

  1. I configured a port labeled DMZ with subnet and DHCP server in 192.168.6.1/24. I want everything that goes through that port form the Internet to be wide open, to let EVERYTHING through. I Googled the f out of it and can’t seem to find what I want.

  2. I enabled a WLAN, but it gets addresses from .5, and I want it to get it from .6, so this AP also lets everything through. Right now I get addresses in the .5 through wireless, and can’t seem a way to point the WLAN interface to point towards .6

I need as step by step as possible; I understand what NAT is and all, but I’m not well versed enough to implement it (I’m used to GUI interfaces, and even Winbox is a bit daunting). Right now if I connect a PC straight in my DMZ port, I get an address and access to the Net.

Thanks