best method to make minecraft enchanting table?

you need lapis for every enchant as well, 1 to 3 depending on which of the three options you pick. and the bookshelves can sit level with the table or one block higher, both count.

book on top, diamond on each side of the middle with obsidian under the book, then three obsidian along the bottom. 2 diamonds 4 obsidian 1 book. for the level 30 enchants you want 15 bookshelves around it with a one block gap, nothing in between (a torch or a carpet in the gap blocks it).