Now isn't a great time to consolidate. Wait until the rates drop. My college loans are under 3% because I consolidated when the time was right. In the next 3-5 years they will drop again, but now is a bad time for rates. You will likely end up with like 5-7%, which is pretty much garbage.
Interest rates do vary but they will never be more than 8.25% for federal loans. Right now they aren't great. If you can afford to wait, you might want to.As far as information about consolidating, go to any of the lenders websites and they give you all the information you need about the process. If your lender doesn't do them, or you are willing to go elsewhere and have never consolidated before, you might want to shop around for a better interest rate. Some are higher than others, some charge fees where others don't, etc.