Don't even think about investing time or money in your idea have done a proper business plan and someone with real business experience, and who isn't a friend or relative, has reviewed it and is begging you to invest. Do not give up your day job. Do not use your savings and NEVER take out personal loans to finance developing your idea.
People who aren't developers are often shocked at the level of skill needed and the hours of work that has to be invested in relatively even the simplest applications to make them saleable.
There are two ways to make money from software: mass-market and niche. To make a (first world) living in the mass market you need to sell roughly 100,000 $1 licences a year and do so every year until you retire. This is difficult because the (third world) copycats will see your success and churn out cheap knock-offs and eat your lunch. As an individual you won't have the resources to protect your IP, even if your idea is protectable, which they often aren't.
Life as a niche developer, where you have expertise in a particular industry and a lot of contacts who are willing to pay for your expertise + software as a package is a better bet. BUT you need to have clients willing to pay in the region $1K - $10K per year for your services and people who are paying that will expect your attention so you won't be able to service more than about twenty of them. Also, you need to be a pretty skilled and fast developer to serve this market, which you evidently are not - at least not yet!
The problem with your 'idea' is that it is niche, but your market is people, you say, who can't afford new iPad. If that's the case you won't even be able to cover your costs.
C.