Now that I'm doing well in IT people ask me, "how do you make money in IT?" Or they ask "how do I get started?" So, I'll answer both of those questions briefly with this quick start guide.
The surest way to turn a profit is to build a shop and a production line to support it.
There are lots of shops to chose from and they all have their strong points, even if it takes a while to find it in some of them 
I'll give the cafe example, because I like cafe. Build 1 cafe, 3 food industries, and 3 cattle ranches. Set your production for cacao, and ice cream. Check the production log to make sure you set it all right. Raise the prices in your shop to 1.5 * normal price, a little lower for ice cream because it's over-sold.
That example uses the better part of 2.5M and it makes a good amount of money for an initial set up.
After that, build more and sell more. Fill all 100 squares. If those 7 squares make 120K/ wu, then 100 squares of cafe should make about 1.6M/wu. Not bad, but not great.
Upgrade your buildings, try other products, go up the RL tree, and get some quality levels. All of these things will increase your income. (well, trying other products may or may not increase you income :P)
Good luck.
-Dave
One-Stroke (slow)
No-Knots (speed)