Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).
Websites like Care.com connect parents with babysitters. The company does all the background checking and other due diligence to put parents' minds at ease. Of course, you can appeal directly to people in your personal network, but if you're looking to generate recurring revenue sign up with a site marketing to parents looking for child care services.
I used to have fun doing surveys while I watched TV. I was choosy about the companies I used and I never paid to sign up for any. I got about $25 in free BlockBuster movie coupons, cashed out about $25 from another site and did an in house project trial where a company sent me to full size body lotions to use and record information about. I had fun, felt like my input was improving the business world, but I wasn’t looking to get rich quick, just earn a little bit in time that typically wasted. Some survey companies pay very little, others pay better. Of course, it is not fair to the businesses conducting the research to lie in order to qualify for a survey and they certainly deserve honest and thoughtful answers to their questions. The companies I worked with told me how much the survey would pay and how long it would it would take. Research for the reputable companies.
However, like anything else truly worthwhile, apps require a significant investment of your time or money upfront. If you don't have the skills, then you have to hire someone who can assist you in creating a great app. But first you need to come up with an idea that will sell. Do the proper market research and analytics to come up with the right app.
Be professional. When you submit a résumé, don’t type it in ALL CAPS and please don’t avoid the caps lock like the plague. Know how to use it without looking incompetent. Write in complete sentences with proper grammar. Of course, there will be exceptions, but even with the exceptions, you must keep it professional. You’re building their view of you.