My questions would be,
1. How good are you at French? Can you use the right masculine and feminine pronouns? Conjugate regular and irregular verbs, in all tenses? Use the subjunctive, and know which verbs form the past tense with être instead of avoir (IIRC)? If so, all that will help you in German. The same things won't always be masculine and feminine, and the subjunctive rules will be somewhat different, but at least you will be familiar with the concept of grammar concepts that are different from English.
2. How good are you at English grammar? Can you easily identify subject, verb, object, indirect object? How good are you at Latin? Can you recognize masculine-feminine-neuter and nominative-accusative-dative-genitive, knowing which words are in which cases and why, not just sort of guessing? If so, that will help you a lot with German. If not, you will need to brush up grammar for both Latin and German. (But the good news is that German doesn't have the ablative or the vocative. Whew. (-; )
3. How good are you at noticing and remembering details? German is easier than French in some respects, mainly pronunciation and spelling -- but your English spelling leaves a bit to be desired, so you may find you need to do a little extra work to learn correct German, as opposed to just in-the-ballpark. Even for a reading exam, if you don't pay attention to spelling you risk mixing up both grammar and vocabulary; one letter here or there can make a big difference.
And who knows, you might want to speak German some day, for travel or singing or who knows what; or you might simply find out that you like German, sort of like a puzzle, a game, a mental challenge. We all did. (-: So if you can find what's interesting about it for you, you're likely to learn faster and have more fun doing it.
Maybe people can suggest a few interesting places to browse history in your period on a beginner level, or sources for vocabulary. You might like Asterix?
Sorry, I had written part of this, went away and came back, and failed to F5 and see your earlier response.
>>that might stand to me?
I think I understand what you mean, but I wouldn't have expected that verb from a native English speaker, though your English is otherwise very good.
The German equivalent of Alliance Française is the Goethe-Institut, but I'm not sure they have any distance-learning offerings, only in cities, and they're not cheap.
Any grammar book or even travel phrasebook will get you started, and there are introductory materials online -- Deutsche Welle, a couple of universities with good German departments (Michigan? Exeter?), and for vocabulary, if you don't mind the cookies, About.com. A good intermediate reference is called 1001 Pitfalls, I think published by Barron's. I like the grammar books by Martin Durrell, which come in several levels. There are teachers in the forum who may have other suggestions; check back in a day or two.
Charlemagne sounds interesting. Good luck. (-: