RIGuy60 saidAncestry.com is good as long as the data is accurate. If there aren't any birth or death certificates shown to back it up, the historian in me says be skeptical. One of my family members brought us back to the Revolutionary War. I wanted to go further to see when and where my family came from. (1530s, Somerset, England is when my family first came to America).
Make good use of public records (birth, marriage, death certificates, land deeds etc.) and registers of towns, parishes, or villages in Germany. Most are free (in England anyway) but you might have to pay them to retrieve something unless you go there yourself. One thing about European ancestry is that they kept good archives. It is slightly easier if you have a famous relative or prominent family (land owner, lots of children) in your past. This certainly helps if your family came here during colonial times as was my case.
To follow up on this - he is right, but you have to understand what you are looking at on Ancestry. The majority of the site is actually documentation - primarily the US, Canada and England but with growing databases in the rest of the world. There are, however, also family trees created by amateur genealogists and old indexes compiled by the Mormon church. Be HIGHLY skeptical of the information found in these sources. Jot them down, think of them as clues but by no means consider them actual source material. Always back it up with actual documentation. It will save you a LOT of aggrivation down the road.
I've been studying since I was 14, I'm now 33. I don't generally do it professionally but I have taken on clients form time to time. Let me know where you are at and I'd be happy to help get you to the next step. I would also highly recommend that you trace as much informaiton as possible about each generation before going on further. It's a little more time consuming but far more rewarding.