Salaries in Aachen

Hello World! I'm planning to move to Aachen in the coming months. The culture, environment and the reason it's near the border of two other countries really stirs my interests in living there. So in order to live I need to know what's the monthly expenses for a single person in Aachen?

1. What's the rent of 1 bedroom, 1 bathroom and may be one kitchen appartment for a single person?
2. What's the usual cost of electricity, heat, water, sanitation and other bills?
3. What's the cost of the food?
4. How much should a person earn/month so that he/she can save ~1200 euros/month?

As far as my life style goes, I'm not a drinker or smoker. I usually spend money on gadgets and computers but I purchase them may be after 9-10 months. I prefer good quality food (don't like junk food much). I usually lead a simple life in the meaning that I don't party or go out of picnics frequently.

So considering all these factors can you guys help me figure out the answer for the questions I asked above?

Your help is really appreciated!