Hi! Im new here!

hello everyone! I am getting into light novels now thanks to animes that I cant get enough of!

now I just want to ask where can I download these PDF's?

1. ero manga sensei (volume 3)
2. oreimo x railgun collab

and would you suggest this newbie some other LNs? like..

1. Little sister light novels
2. LN that revolves around an otaku (like Kirino, Konata, and the protagonist from Gate)

thank you so much!!!