If I were in your position starting out at a young age I would focus on building my credit score first.

Seller financing will be "golden", turn-key is the awesome sauce, and with a target of APPRECIAITON, so appreciating market NOT based on hopeium but on MATHS.

As for other ongoing expenses that will really vary by property age and condition.

We are quickly approaching the Silver Tsunami of the boomer generation aging into needing assisted living.

Mainly I’m trying to avoid “aged poorly design” glassblock walls, small bedrooms, older windows (wood/aluminum, single pane), aluminum patio covers, and to a lesser extent landscaping.

Since I am married and have school age kids, I place a real premium on minimizing my management time. 

A more typical rule of thumb is to budget 10%–15% of gross rental income for maintenance and repairs over the long term, depending on the property’s age, class, and location.

What is the age of your business LLC? 

You might also want to consult local property managers or rental market reports for a more accurate picture.When it comes to estimating CapEx during preliminary analysis, without visiting the property, you can use a general rule based on the property’s age and condition.

I've tried a couple - truepeoplesearch, white-ages, property radar, leadsherpa, batch leads...Some services are better than others, but it is a numbers game and you also can cross check between different platforms.