Lots of people shared their opinion and experience and I only wished I knew of this site before I started investing in real estate.
A few things I didn't read (or maybe I missed) from all the great posts -
What is your end goal and what is your risk tolerance level? What other investments do you have and what types and how does real estate fit in the overall strategy? How much involvement are you looking to put into it? What is your time frame? These questions will likely guide you to decide how you want to invest the $.
If you are borrowing $ to buy real estate, make sure you save $ for cash reserves. Based on 20% down $250K can get you $1.25M worth of properties - but you will need to have cash reserve for the properties in case of any unforeseen situation.
If you decide to go with turnkey investments, make sure you know what you're getting into and your exit strategy... You can search the forums for some heated discussion on turnkey. :)
Talk to your accountant / CPA and set up a spreadsheet to track your expenses if you decide to buy properties. It's a great tax write-off strategy if you don't own a business.
Good luck!
Henry