week 1, 2 maybe 3: search for popular android applications that have low ratings that you can implement, sort them whichever way you prefer, do some wireframes and plan your first project. Do not spend less than 3 weeks. Do not spend more.
Week 4: This is the most important week. Figure out the tech you will be using. Make lots of demos projects, fail a bunch of times, set up libraries, APIs, accounts, integrations, link them to your project, whatever you need to get this to work. You have to know what you are doing before starting the project.
month 2, 3: implement a very simple frontend and a backend for that project. Cut corners on features, but make sure it doesn't crash. Test, test, test. Plan ahead. When a feature is done, do not look back. Do not spend less than 2 months. Do not spend more. Monetize, that's why we are here. Free to download, but put 1-2 features inside the app that can be purchased via google play. Make them $10 each.
month 3 week 1, 2: Automate deployment on server side, deploy on google play, send to friends, go on reddit, HN, itch.io, spread the word. Your goal is to get at least 20 customers a month. So one person a day. Assuming you did something that has a conversion rate of 1/100 (worst case), you need 2,000 people to see it every day. Google play will do most of the work for you.
Start the next project. Hopefully the first project will start getting traction.
Repeat this 3-4 times. Let your previous project's ratings and money motivate you. Things will accumulate over time.
Things don't work? No problem. Now you have four apps on the market to show to your next employer and a bunch of new experience.