Well, this is a pretty vague question, tbh. I mean if you just searched "how to make sprites" it probably wouldn't get you much anywhere. Really, the term "sprite" for a character is, I believe, a pretty RM specific term.
However, this tutorial might help you get started.
Also, I'm going to move this to Resource Support, which is what that section is for - asking for help in creating resources.
@Celianna Ahh yes, sorry. I mean like walksprites and talksprites or tiles. Anything really. I only have PaintDOTnet and Medibang and everyone who was teaching it was using GIMP, which my computer can't run.