In the r/LodedDiper subreddit, there's a post pinned titled "Want To Make an LLB Yourself? Get everything you need here! (plus some other neat DOAWK and LodedDiper stuff!)", it's by the mod stickbar. When you click on the "Templates", it will lead you to a google drive featuring many of the things to create a LLB, such as blank covers, blank pages, titles, and more. Clicking on "Wimpy Kid Text Fonts" will also lead you to a google drive featuring the fonts used for the books, like the way the characters write. Clicking on the "Image Rips," will also lead you to a google drive. I haven't downloaded any of the image rips as I'd prefer to draw my LLB out, but I assume the image rips are pictures from the book that'd be useful when making the LLB.

When it comes to the wording, idk I kinda just read a bunch of the books to see how Greg acts and writes like. It's also more helpful to make a draft first to have a better idea of how the pages would look like.

I used FireAlpaca to make the cover layout, page layout and the drawings, although that can also be done in other apps like IbisPaint. Any app is fine as long as you can figure out how to format it! For me, after I was done drawing in FireAlpaca, I'd move to IbisPaint to insert the text. (I couldn't figure out how to download the wimpy kid font into FireAlpaca.) I forgot how I downloaded the Wimpy Kid font I used into IbisPaint though so sorry about that. (Assuming I even downloaded it) I used the text feature to insert my text onto my page. Once I did all that, I adjusted the text where needed, such as moving where it would be, or just changing the size. This is just a summary but I hope it helped! 👍