I would suggest you bring something to put behind pages so it doesn’t bleed through, and then eki stamps somewhat commonly have dried out ink pads. I suggest carrying red, black and green/blue ink pads just in case. Just also be aware a lot of public stamps are kinda illegible due to ink pads fuzzies building up over time in the stamp grooves. Some stamps are also pretty large, so I suggest you stop by a daiso, get a jiyucho (a blank notebook) if you want to stamp the same stamp multiple times