rpg maker is solid for starting out. The database is easy to update, and you can get a lot out of it by just using event logic rather than full on coding. My suggestion for learning is look through the event action options whenever you open an event. It's easy to forget the options since there are so many and i'll usually get an idea for something to add whenever i look through it.
Also, that was very nice of you to help your sibling. I don't think i got to play that game yet.