It's possible that Luke stored everything he had collected in his new Jedi Temple, and it was all destroyed here: https://i.imgur.com/bRll1yT.jpg
But hopefully that's not the case, and Rey(or whoever) will stumble upon it later -- it would be a shame if all that knowledge was destroyed. I mean, if Palpatine's relic room could survive the Death Star's destruction(and subsequent planetary reentry) there's still hope. /shrug
As for Luke's saber: there's nothing definitive on its whereabouts, but the TLJ novelization implies that he gave it to the caretakers of the ancient Temple on Ahch-To when he first arrived there.
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
That said, aside from his saber, I'm not sure what other "weapons" Luke would've had with him at that point? It's not like he was still carrying around a blaster when he went to Ahch-To. /shrug
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."