One of the best places to go is the QDMA forums like Criggster stated but it is currently down. You can still check out their articles. I also like Whitetail Stewards for information. It's not updated too often but has some good info in there on different plant species.
http://www.qdma.com/
http://www.whitetailstewards.com/homepage/homepage.htm

As for the stumps you can do as Climber stated or try to find someone with a stump grinder. They had some ways to get rid of stumps on the QDMA forums but of course they are down right now.