Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
You could easily do home organizing for people, an industry that has gained a lot of popularity since the debut of Netflix's hit series Tidying Up with Marie Kondo. If you're a tidy and organized person yourself, and you're good at organizing spaces, why not offer your services to people around you? You'd be surprised at how many people, even on your own social media feed, might take you up on doing something like this.
JVZoo was founded in 2011 and has since rocketed to near the top as one of the most popular affiliate programs out there. JVZoo is unusual in that there are no upfront costs for either publishers or merchants (advertisers). JVZoo’s income is exclusively from charging fees (to both the merchant and the affiliate) after a sale has been made. It is also unusual in that it pays commissions “instantly” via PayPal rather than once a week/fortnight/month like other affiliate programs.
I would personally agree with linkshare.com as a great affiliate marketing platform to join as a publisher. Here’s why. Back in 2005 when I knew nothing about affiliate marketing and was using blogger.com as a free blogging platform without any experience whatsoever and joining Walmart.com as my first official affiliate program, I was able to insert Walmart affiliate in its in my blogger blog and earn a $72 commission. I was onto affiliate marketing for life from there.
Complete errands or tasks for the elderly. Older people often need help with buying groceries, cleaning their home, performing home maintenance, and paying bills. To find clients, contact your local community center or church to find out if anyone needs help. Additionally, you might post an ad in your local classifieds or talk to people you know to find out if they know someone who needs help.
If you have a background in a specific field, you may find there is a demand for writing industry papers in your area of expertise. For example, there are often adverts for doctors, lawyers, nutritionists, and business experts from particular niches, to write white papers on different subject areas. These are well paid jobs that you will need to stake your reputation on, but that can often be worked on from the comfort of your own home.
I realize my bias is already showing through, so I’ll get to what I DON’T like about Wealthy Affiliate below. But, as I’ve already stated, overall I don’t know of any other place that is better for new affiliate marketers to get started than Wealthy Affiliate. If you take a look around my site, you’ll notice I’ve spent a TON of time on it. I’ve spent years of my life building this site, and there are currently almost 500 posts here, all for free, for everyone. It is in my best interest to promote only the best training course and that training course is Wealthy Affiliate.
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.