One thing, though, there is a big difference in making an app for Android and an app for iOS, and that is the fact that making an app for Google Play costs just 25$ one-off, making an app for iOS costs 99$ a year, so if you are making an app for iOS, I will recommend you to be a bit more confident about the way you will make money by your app, than if you are making an app for Android.
I have yet to find a survey site worth the time. They ask you tons of information about yourself then send you surveys where you have to answer the exact same questions over and over again. Then, after spending 10 to 20 minutes answering questions, you are told you don’t qualify. I want a survey site that takes the information I have already provided and only sends me surveys I am qualified for. Most times I feel they have gotten the answer they wanted and then say I don’t qualify just so they don’t have to pay!!!