You will need something to get started right?
Just to remember what are the main roles and their responsibilities.
Start making your pixel art with this advices!
Make some animations!
This tool can help you a lot if you are bad at pixel art!
If you are a GML self proclamed programmer (as i), this Is your Holy bible
To make easier what you learned in the GML book!
Those jumps will need some sound fx don't you think?
Why don't you try your first game in this easy tool?