When you decide to go into real estate you must do careful calculations, that's what makes it an "art" as Karen says.
You have to take into account everything (for costs), maintenance, management, the mortgage, tenant occupancy, utilities, insurance etc.
Also you should go outside you realm for reading, Robert Kiyosaki's books are just a synopsis on business and real estate, and all 5 of those books are clones of each other.
To make money on a place you need three things:
1. Good Tenants (This is all part of the process)
2. A Good Mortgage
3. Low Price on the Building
All these things coupled together make for success (usually).
You say that the house prices in your area are going down.
Well then it might be a good opportunity to buy!
Find those bargains!
In response to your bad tenant ordeal, my friend, you have to write a good contract.
If you want the tenants to take responsibility it has to be in writing.
Also, a fully furnished house (as you say with fridge and such) is not a good idea.
If the tenant isn't willing to move their own furniture in they're probably a bad tenant.
That is they will treat the place like it's not their own.
Having their own furniture, fridge, washer, etc shows their commitement.
ALSO remember it's at the price you buy where you make your money.
You should look for a minimum 40-50% (perhaps 30%, but then you negotiate) discount.
Watch for those motivated seller.
E.g. they're moving, they're retiring, there was a family death and so on.
For example houses in my area sell for $300,000.
If I get a house at $150,000 or $160,000 then this is a good deal.
Oh btw I have a careleton sheets (like kiyosaki) program if you're really interested in real estate.
I can burn you a copy (i put it in mp3 format).
Just contact me,
harry1984@hotmail.com
Give me your address and whatever.
I'll send it for free...if i have any money left over this week.

I also have some books if you're interested.