@Byoung Bae Welcome to BP!
I think your goal of getting your first RE investment for around $50k is doable as long as you plan to leverage debt (Loan). I currently have eight out-of-state investor clients that I've worked with in the past (some on more than one purchase) and they were all attracted to the Lansing, MI area for it's affordability and steady cashflow.
To answer some of your questions:
1. What should be the number first step after picking a market? I am looking at listings online, running my numbers. Many of them barely hit the "1% rule". - You should hop on a phone call with some agents in the market you are interested in and ask about the area, their experience, to run some numbers with you and then even do some virtual tours with you of some active listings.
2. Assuming I purchased a property, how do I find renters? Do I lean 100% on the property manager to find renters? How do I know the vacancy rate / how long it took to find renters for comparable properties? This would be one of the most important inputs for "running your numbers". - Vacancy rate & rent amount all depends on the market and neighborhood you're in. Some of my clients manage their own rentals (even when they live in another state) and simply have a local handyman to do repairs and showings. My other clients rely 100% on a Property Manager. Platforms like Zillow, FB Marketplace, Avail, and other PM softwares do great with rental listings.
3. Many suggest to "build a team" for out of state investor (e.g. realor, PM, handyman, etc). How do I go about doing this? Who is the most important member/first I should focus on? - You do this by exactly what you're doing here. By ASKING! You've already completed the first step. I'm may be biased (because I'm an agent), but a Realtor will be your most important team member to start off because we are usually the most networked and have Property Manager, Lender and Handyman recommendations for you already.
I hope this helps! As always, I'd be more than happy to hop on a call with you to go more in depth on this topic if you'd like.
- Troy