Yes, you need capital, or at least good credit. Property management companies are hella expensive, and in this labor market hiring a super is difficult, so...you are going to wind up doing a lot of things on your own, the most important of which is screening tenants to avoid credit risks according to whatever the local laws are that discourage such screening.
No thanks. A lot of people are getting out of it, or finding it is often better to keep a house empty and just record the missing tenant as a loss to write off than risk renting to tenant who is anything but perfect. The future of renting is from big companies who have enough scale and experience to manage the risk. Small-scale private landlords are on the way out.
The immorality of such rent-seeking not with standing, it is just not a very good way to make money unless you are really. diligent or get lucky.