Many successful entrepreneurs started by inventing a new to-do list. This is because it is the only way to come to terms with what it means to get things done at all.
There is literally no better use of a first-time entrepreneur's time than reinventing to-dos.
If for no other other reason than due to the sheer absurdity of the idea of procrastinating over creating a to-do list. It's something you can't help but do immediately, and is "self-hosting"!
I might have been exaggerating, but I think it's a good exercise in coming to terms with your abilities and task management ideas in general, to create your own to-do system ahead of anything else you're doing.