There's a big learning curve here, but if you're up to the task it's loads of fun!
For most people it's necessary to read the Orbiter manual (I'm sure there are exceptions, but they prove the rule) - all the basics are covered in there, and it's all stuff you need to know. Try starting with the Delta-Glider, too, as it's the easiest platform to learn on.
And as you can already see, there are lot's of people here on the forum willing to give some helpful advice.