True those words are N4 but some decks on Anki will include those since those are common words.
But even if you use only N5 decks you can guess the meaning.
When I was starting I barely understood a thing and yet I was able to guess the meaning. You just get: "please ahead **** **** don't go ****". "Yeah it probably means to not go any further."
I mean true, you can't fully read the message but enough to get the meaning.
Your translation isn't bad but I'd say it's too literal. I'd translate it to something like this:
It's dangerous beyond this point, please don't go any further.
Though keep in mind I'm no expert and this could probably be translated better :p