Welcome Mike!
1. Go with what your market supports. If nobody is living in rental houses, don't do rental houses. First though, I would listen to the podcasts. Keep reading, keep learning. Keep up on Zillow or Trulia and craigslist. Find out what properties are selling for, how long they are on the market. You don't need to know everything but check out the best book list for ideas.
2. I would make a decision about #1 with your wife, you have GOT to be a team. And a baby on the way. Doing a full day's work on 2 hours of sleep is... unpleasant. What helped me was my wife saying to look at "scary" situations with the mindset of, "Logically, what's the absolute worst scenario that can happen?" If I'm okay with that possibility, then go for it. There is also a risk if you don't invest. What if you lose your job or the stock market tanks or social security goes away. You could also point out that putting money under the mattress is actually losing money from inflation. And there is plenty of opportunity to be frugal with rental properties to fill the void.