Add special abilities to custom tools

Hello guys.

I don't have any coding-skills but i want to learn how to. I'm thinking of creating a tool which acts nearly similar to a Pickaxe if it used for mining except that it mines a 3 x 3 "wall" in front of or above or beneath the player. Can some tell me how to manage that or show me where i can learn enough to write a code to create somthing like that?

I know that sounds strange... a greenhorn trys to write a code in java for a custom Minecraft tool with extra special ability.

My Idea was to create the basic Item i want to build in MCreator an than add the code with this special abilitiy to the code of the basic item :D... just to minimize the coding part ;)

Thanks for your help ^^