It's a very interesting hobby, Lizzie. I too many times have been interested in knowing about my ancestors.
And on my father's side, I have some information because one of my uncles for a long time was researching and collecting old letters that my grandfather kept. His origins were Spanish. On the other hand, I don't know much about my mother's family tree on her father's side. I only know that my great-grandfather came from Germany during the first world war, but we don't know much more since my mother lost her father when she was fifteen years old, and she was never very close to my grandfather's family. Maybe with those DNA tests, you mention we could find some relatives in Germany. It would be cool to have the money to do so.
It is a fascinating subject and I hope that at some point you will be able to devote some time to it.
RE: Silver Prompt - Searching for my Roots