JapanForum.com - Need help:Going to a V-kei Show for the first time (in Tokyo Zepp and in a livehouse)

Hello everyone! I'm new here but I may just post more and more now that I found this place.

I'm a big fan of the group Psycho le Cemu (which have been in pause since 2006) Next year, they are doing some shows in February and I will do all that I can to have tickets. I will travel from Canada to go see them.

Now, I have never been to Japan, and I went to very few shows in my live (and of course, no Japanese show).

Sadly, my Japanese language skills are pretty limited, and I am trying to learn, but I am also lacking time since this travelling plan is so sudden.

Here is where I need advice: I would like to know, if any of you already went to some V-Kei show , how it usually go? Are there some rules, things I should know, etc. I want to do my best not to be rude and I do not want to cause trouble, or to get lost, etc.
Their show will be at the Tokyo Zepp, in Odaiba.

I also possibly plan to go see Dacco and rice who do a show in what i believe to do a livehouse. Again, I know it is supposed to work very differently there, but I have no idea how it work and again, I want to act as perfectly as I can...

Can anyone help be?
(also if anyone is actually going to those show, it would be great if you want to message me privately or say it here, I will always be happy to meet fellow fans)

Thank you!

Josiane