Congratulations, welcome, and good luck.
Don't know what you need to know, but here's a couple things we do well, learned to do well, or still do poorly:
1. Make lenders compete for your business. Funding will be a huge component of how you cash flow so get to know as many lenders as you can. There is a limit to how many conforming loans you can get from a bank, so make sure you start looking for direct lenders early.
2. Know your limits but be confident enough to ask and negotiate for what you need. Property management rates, lease renewal fees, origination fees, cost of appliances, cost of paint, contractor's quotes, and how many properties your wife lets you buy at the same time; all negotiable.
3. Don't be afraid to raise rents. The real cash flow comes after 20 years of inflation when your P&I payment is the same, but the amount you are charging in rent has doubled. Be fair and reasonable, but keep up with market rates.
4. Be picky, every time you don't get a deal, someone is accepting a smaller return than you were willing to. Don't be willing to pay more than you are comfortable with. Slow and steady pace means you have time for it all.
5. Don't quit your day job..... yet. If you can hang on, w-2 income is consistent and safe when a bank looks at you and is deciding, if, how much, and at what rate to lend you money. Make sure your income stream from real estate will support you, even in a market down turn when rental rates drop.