Before you begin reading manga, I would suggest reading graded readers since you should know most of the vocab and it will gradually increase in difficulty. The most popular option that I am aware of is

White Rabbit Press graded readers

(which are available on Android and iOS or you can buy the

physical books

(I bought the entire series and have found it to be a great stepping stone)). I've seen ads lately for

this series

as well which is available only in digital format and is roughly the same cost as the White Rabbit Press reader (albeit a far smaller series). It sounds like they're still making books and if you make a purchase then you get any future books as well. While not related to reading, it's worth mentioning that both of these graded reader sets offer audio versions of their stories as well so if you're looking to improve on listening practice then that's an extra reason to buy them.

Question, when I am in The great library (Choko choko) and click on 金魚（きんぎょ） | Goldfish it becomes blank and redirects me to http://ww1.firegrubs.com/, am I doing something wrong?