Its kinda easy to make them just draw ur frames then use this Download : Spritesheet and XML generator [Friday Night Funkin'] [Modding Tools] (gamebanana.com) this is how i create my fnf custom sprite sheets once you have your frames ready click generate xml and you can code the custom sprite sheet in with fnf multiplayer its the only way i know

You can also use kade engine or ninjamuffin99's engine to code it but i recommend fnf multiplayer its more easier to code in.