The procedure for flashing any rom on the zmax is the same as any other device, other than the fact that we have to use switchers to get access to the system partition. All the instructions and info for using switchers can be found on my thread in the first 2 posts. Its a sticky thread so it should be pretty easy to find.
The way to use the broken switcher is just a little different because it is done via an app instead of flashing zips over and over. The zip for the broken switcher just installs the app and puts the needed files on your internal storage. It also does put an "old fashioned" restore zip on your internal storage in case you do something that causes a bootloop.
I see that you have already downloaded the BrokenOs ROM zip, GApps, & Broken Switcher zip.
Just reboot to twrp, advanced wipe(system, data, cache, & dalvik), if you want to format data also that is fine as long as anything you want to keep is already on your SD card. If you don't format data then I recommend you delete any and all unnecessary files and folders on your internal storage with a file manager before you flash.
Next flash the ROM then gapps then broken switcher in that order. Also don't reboot in between flashes because that has always caused gapps problems for me in the past. Just flash all three back to back in the order I mentioned. There is absolutely no need to wipe anything after flashing the ROM, gapps, & switcher. Wiping after you already wiped then flashed is just redundant.