a) Published: 2
b) Paid/Free: 1 paid, and a free 'lite' version of it
c) Marketing: Fair bit of effort (AdWords, AdMob, traditional + web PR, social media). Have seen little measurable effect.
d) Income: >$50k in year one.
App is for a particular topic in music education. Broadly speaking it's quite niche, but to a musician audience it's widely relevant.
Since it is a specialised education app I priced it at $7.99. I think this is the right choice, but haven't experimented with the price point much.
Income was boosted maybe 40% by being featured on the App Store (New & Noteworthy) for a few days.
About to finally release a second (paid) app - I think it's a stronger offering, but it will be interesting to see if it does anything like as well as the first!