One thing I have heard mention of here is taking move concepts from other games that have been posted and using them when playing against yourself.
It is viable for the early moves, but becomes impossible in later moves. Still give you a chance to try out your own concepts against varius moves and opens by other players…
How can Germany beat the West Russia Stack?
How to handle Egypt and India?
German Med Fleet Uses?
Just use the concepts and ideas posted, form up your counters, and see what works.
Then, once you are comfortable with your strategies, engage one of the folks on this board in a game, and test it against a real opponent.