Newbie OLE, Word, my file into Word as an object -QUESTION

I have made an application. I am extremely fond of my application.
It prints and displays on screen the most beautiful trees of some data.
I save each tree as a file.
Now, I want to be able to insert my print of my beautiful trees into
Word as an object. I reckon I have to make a .dll and some registry changes
in order to make this work.

Can anyone help with a to do list or code?
Point to some good examples on the internet?

Thanks in advance,
Christian Loft