Hello and wecome aboard!
Monarch is shipped with a Learning Guide (a PDF file you'll find on your Windows Start menu under Monarch), and that'll be the best place for you to start. Block off a couple of hours, and go through the exercises in order, and don't skip any steps along the way.
It won't tell you everything you'll ever need to know about the product, but it will most certainly get you productive and started, confidently, on the right track.
After you've completed the guide, and you feel like you really want to fast track your Monarch knowledge, you can always take one of the courses offered by Datawatch, or, even better, attend the (rapidly approaching) annual user conference.
Until then, if/when you get stuck, you know where to come for a bit of help!
Have fun, and we'll see you soon.