There also is various free image editing software that is similar to photoshop available and definitely better than paint. I use GIMP to edit images but I am sure there are others out there, check the forums for a discussion about what is available or what people recommend.
Author didn’t put enough into the first chapter to hook more than generic magic manga tropes. Casting magic with incantation, must be demon, you’re really my nephew not my son, your mom is dead, get out, kid steals to eat and rich looking dude picks up kid off of the street. Not interested.
Assuming that first post was in reference to the translation, it’s a safe bet that this chapter was a crappy google translate chapter given the username. I hope I’m wrong and the chapters are hidden, pending moderator approval.
Please work harder at translating this, several sections don’t make sense. IE talking about going to another planet, but not another world. I would hope you are not just using some machine translation for this.