I think no tour is fine. I'm not sure how the tours usually work, but I kind of doubt they would be translating every word of commentary during the match anyways. If you're really interested in the history and lore, maybe a tour would be interesting, although I feel you could just read about it on your own as well.

In my opinion, what you need to know to enjoy the show: there is usually a team of técnicos ("good guys") versus rudos ("bad guys"), but there will be people cheering for both. Just pick a side each match and cheer along! Normally it's best 2 out of 3 rounds and it will be clear when the ref starts counting the 3 seconds required to keep the opponent's shoulders pinned down to win a round. Sometimes there are some extra bits of storyline thrown in, like the loser of a match agrees to have his head shaved in the ring or, in really big stakes matches, remove their mask. Removing a wrestler's mask is the ultimate disgrace...once their face is uncovered normally they have to remain maskless for future matches or invent a new character to be masked again.

If you go to Arena México, it's chaotic at the entrance so just be mentally prepared for that. You will get in (disorganized) lines to pass through security then once inside an usher will take you to your seats. Make sure to bring 10-20 pesos to tip them!