The Microsoft Word component is a very powerful tool since it gives you complete access to the Word object model. To understand the full capabilities of the Word object model you will need to do a little research but anything you want to do is possible. The best place to look is on MSDN at the Microsoft.Office.Interop.Word namespace site. When searching for an answer i usually Google "C# Word Interop {question}" and find the answer quickly.

The magic in automation to access the Word object model is to use a proxy. The MicrosoftWord component has a property named WordDocument - extract a proxy from that.

Now select the proxy and go to the Object Inspector and you will have over a hundred properties and methods available. Using the documentation on MSDN you can then proceed to build an automation. If a property of your proxy is a complex object you will again need to extract a proxy of it to see all of the properties and methods.

Here is a simple automation to append text at the end of your document. Notice that the _Document proxy has a property named Content which is a Range. A Range object has an InsertAfter method.