BEFORE READING I ONLY MADE TUTORIAL ALL EMBEDS ARE MADE BY OTHERS AND I HAVE NO CREDIT FOR THE WEBSITES!
First install Plugins: Minecraft: Entity Wizard, Minecraft: Item Wizard and Minecraft Block Wizard to make any thing that those plugins can do.
Blockbench by JannisX11 and others
Then rename from (.mcaddon) to (.zip) then extract (RECOMMENDED APP TO EXTRACT IS 7zip) open the BP then create a folder called "recipes" if there is no current folder. Then re-open your browser and scroll below
Crafting by thedestruc7i0n
Use this to Make a recipe and ad the item, but make sure to add the id (yourusername:my_item) and also make sure to change the Minecraft version to bedrock as well as the Output Recipe: to the id then copy/paste the recipe .json into the recipes folder then go into minecraft and craft your item!