Gentrification & market supply/demand

Hey everyone, it's been a while since i last posted. Just starting out on my PI journey and I can't wait to get started once I get married at the end of the year! :D

I'd like to find out more about how to research gentrification and also identifying the supply/demand relationship for the housing market.

1. What are some of the ways to find out about gentrification trends? Eg. are there any websites available?
2. How do I find out whether a particular suburb has low supply and high demand?

Thanks for the help, much appreciated! Been reading the forums daily to continue learning and it's been a great experience - now to get cracking!
Thanks for that forumite. I was beginning to think I asked a bad question because no one was answering! :confused:

I'm just doing my best to learn how to do good due dilligence, though I have to be careful not to do have the 'paralysis by analysis' syndrome!