Seconding this. Don't go for a first game that you would publish (if it turns out well enough, you still can). A simple story, one character, two or three decisions. See how good you are at positioning, writing, coding, what you like and (inevitably) what you hate about the process. Then you have a first feel of how to approach a "real" project.
Also do not underestimate the length a project takes with you "always" needing to do something (holidays may be okay) before asking people for money. Many projects die because enthusiasm dies - we all did something in out life for a year and it was the best hobby ever, only for it to fade into obscurity somehow.