What was the total income received from app development?
I signed up in August. I made about $10-$15 through iAd and 30 cents from Ad Mob
What were the total expenses for app development?
Besides the $100, I purchased a few graphics for probably about $30 and I took a couple Udemy courses for about $60
Is this the first year you've had income from app development?
Yes
If you paid more (e.g. $99 fee) than you made in income (e.g. $26) then you don't really have a "business". You have a hobby. That's not an insult, it's what the IRS considers something you spend money on that doesn't yield a net profit (income > outlay). You don't need a "business" tax-prep pkg to fill out the "hobby expenses and income" section of a tax form (assuming you have enough expenses to even itemize deductions).
On the other hand, if you filed last year as a sole proprietorship because you had income from apps, then you should probably do the same this year. However, if your expenses exceed your income, and it's the same last year, you'll be in at least your second year of business losses. I forget the specifics, but you need to show a profit in N out of M years to file as a business with net losses (I don't recall what N and M are, but any real tax advisor would know).
If you're still not sure, then consult a competent tax advisor. You might be able to get a useful answer by calling the IRS itself. They have a website and an 800 number, as I recall.