I had no codeine experience. I started to do tutorials and at the same time started to develop my app. I have a MVP on my phone which I used at auctions. People who sat next to me would see the app and ask me what it was called so that they could get it and I would have to tell them that it was not available yet. This gave me a lot of encouragement. After 4 rejections, I finally got it accepted by the App Store.