The best way to get into making your own assets is to study other sprite styles and gradually pull away from it until you find a style that you can call your own. It doesn't happen overnight, so be willing to let yourself learn. Heck, I learned pixel art with Dragon Quest edits and frankensprites, which led to making my own.
Unless you're in a rush to make some big commercial game, in which case maybe hire someone or buy an asset pack.