I will give stock photography a try. And start with Shutterstock. I have read that Shutterstock have actually a payout limit of $50, its much! But some one of you said on shutterstock its eseaier to  hit the pay out limit?

I will try with my existing pictures, and make some new extra for stock. Then i can decide if i resume with it or not.

Ok how much time i should give it before i can decide?

1 or 50 or 1000. Or maybe somewhere in between.
It depends on your skills, subject matter, postprocessing, keywording, which agencies you supply, etc.
If you are a beginner to photography, it's going to be very tough.
You are like 10-8 years too late.

I am a beginner in selling my pictures, but not in the photography. My subjects are: architecture, landscape, travelfotographie. But no pro shoots with models.

I dont use much postprocessing. At the begining i will try with fotolia. Which agency you can recommend me?

With these conditions starting, whats your opinion i can except on money. Can I achieve $10 - $50 pro mont with my "normal" pictures nothing incredible. How many pictures should I have? In wich periodi can except this? In 3,4,5..12 months?

Best regards