I'm closing on units #24 & #25 next week.
Rentals so far has been an absolute blast and I looove being a landlord.
I started out as a real estate agent with the goal of getting into development, took a while but now I'm finally here, biggest problem has been getting the $$$ structured so I could buy more than a couple.
Biggerpockets has hundreds of experts and thousands of people who have at least some experience. I've used it a ton and made some great partnerships on there, be sure to read through the articles/blogs on there, tons of good info.
Don't go to seminars, don't pay gurus, don't pay for anything other than a few books. So far I've only had one larger investor tell me he learned alot from a course and the name escapes me, everyone else that I know has learned from bigger pockets (Outside of painful trial and error).
My thoughts on rentals are :
Plan to buy a few of them - stuff gets cheaper with economies of scale. When I started buying I wanted 500, I still want 500 and I hopefully won't stop till I'm there. There's alot you can do with a dozen rentals that you can't do with one, such as having part time help do the maintenance.
TRY to manage yourself. Most management companies don't care whether your property is vacant or occupied, you on the other hand care a ton. This may limit you since I wouldn't recommend having properties too far from you, but to me it's well worth it.
Don't go cheap, but learn to be effective. If you're doing higher end rentals it's not so bad, but for me many of my properties are in iffy neighborhoods. I will not put in nice carpet due to the likelihood of it being trashed, I will however put in a good furnace as it decreases HVAC related problems and decreases my long term costs.
Spend more time on finding a deal than anywhere else. You make the most money when you buy, not when you're renting it out or dealing with the property. Next week I'm closing on a duplex I got for $9,000 because I was the only one that bid at auction on the property. It'll bring in $1,100 per month before expenses. After expenses are considered it'll pay itself off very, very quick.