Don't know where to start looking online for genealogy information? Cyndi's List is the place.
It's been around for quite a while and is full of great stuff. It's a huge list of genealogy resources found online. They are all categorized and cross-referenced. She keeps it as up-to-date as possible. And it's all for free.
So, if you are stuck with where to go online for help with your brick wall, or starting to look in a new country, check it out and wonder why you never went there before.