In determining whether qualified nonrecourse financing is secured only by real property used in the activity of holding real property, disregard property that’s incidental to the activity of holding real property. Also disregard other property if the total gross fair market value of that property is less than 10% of the total gross fair market value of all the property securing the financing.
A planning opportunity may be available by converting a primary residence into rental real estate.  For example, Mary purchases a condo in 2010 and in 2013 decides to upgrade into a single family home.  She rents out the condo to earn some money.  Due to recent developments in the area, the condo is now worth much more and she sells it for a gain of $100,000.  Since Mary lived in the home for 2 out of the past 5 years, the entire gain is excluded from income.  The 2 year rule can occur anytime during the 5 year period and does not have to be consecutive.  Keep in mind though that if you do the opposite and convert rental property to a primary residence, the rules are more complex and the gain exclusion tends to be limited.
Secondly, analyze all of the features of your app. Is there anything you can remove? Is this the most simplified version of your initial app idea? Chances are that you can still remove some features. Leave only the essential features of the app. This is very important. You will get your app out to market faster. Which means you will get feedback for your app earlier to improve it and tweak it to meet customer needs. Also, development will be cheaper. It’s better to keep costs down, since you don’t know if your app will be a hit yet.

I have only dabbled in drop-shipping before when I had an eCommerce platform 6 years ago or so. I think it is something that you could do on the side, but you would want to do in depth research on the industry you want to get into before setting up shop. It may be a little less passive up front, but over time you could take your hands off the wheel.