Actually Adobe is pretty decent about including a pretty robust help section with Livecycle. Not 100% sure what OS you are using, but in Windows if you go to Help they have a Welcome Section that have 3 How-Tos on creating a few forms and each has about 20 or 30 subjects ranging from simple form design all the way to calculating field totals, digital signatures and tables. They also have sample forms that go through each one of these tutorials so you can download them and futz with the code. They also have Scripting References if you want to get into that. Unforunatley Livecycle is such a specialized software there is not a wealth of websites or help guides, but the integrated stuff is pretty decent. If you do not have Livecycle I put a link to the online Livecycle Help Section that has much of the same things.
http://helpx.adobe.com/livecycle/topics/livecycle-designer.html