Unfortunately there no longer exists the original website that contained the basic tutorials on NWMAx itself.
However there are many various tutorials available on the website located in my signature. Many folks overlook them because they believe the tutorials to be strictly tileset related. However, the tasks that need to be performed like how to enable / use auroraflex etc, ARE covered. You just have to apply the steps to whatever you are doing. Basically, my advice is to peruse the different tutorials available there and see if you can pick up enough of the tricks to help you out.
Reset X-forms is a life saver... use it often!
Also, be aware that nwmax 0.8 WILL work with all versions of 3dsmax, but you may have to manually install it instead of using the self installer version.
NWMax plus, has two changes that might help, one increases ram for scripts, the other I can't remember, but both are already included in it. The downside to NWMax Plus is that tools were removed, also locations were changed (Ie menu changes) and a huge amount of ram gets wasted on functions that ONLY apply to games other than NWN. IE vast code bloat for other games.
Back to the version released by DLA, nwmax 0.8,
PSTmarie released some tips for getting the 1.69 walkmesh material id's added into nwmax 0.8,
There is also a listing of various other tutorials here
Custom Content Tutorials List that is really useful. Too bad that we can't get a moderator to actually sticky that thread for us.