Hi shortforsophie,
I would start with a blank, lined piece of paper, and list your priorities, starting with the thing that is MOST important to your life right now. Several will come to mind, so just write them as they come to you (you'll have to write fast!). When the ideas stop flowing so fast, go back and single out the top three. There's your starting point. Take one of the three, write it on the next page, and write down what you need to do to get to that goal. Then do that for the next two items.
Just having these down in writing helps, but then it's time to take action and take the first step towards the first goal. As you complete the steps, check them off and congratulate yourself on your forward progress!
My favorite app for organizing is Color Note Notepad Notes; I use it daily for reminders, shopping lists, to-do lists, wish lists, songs to remember, recipes, my husband's sizes, etc. It lets you write either text notes or check-off lists, color-code the notes, email them to yourself or someone else, put them on a calendar, alphabetize them, all kinds of things.
Good luck and happy organizing!