Welcome to CYS!
Almost everybody has a list of good storygames here if you want any recommendations, but personally, I always suggest reading, rating, and reviewing the newer games. You'd make Mistress M happy, to say the least.
A great way to practice your writing is to write linear short stories on Creative Corner. In fact, anywhere you can read and write is a good place to refine your abilities.
Of course, as a lurker, you most likely know most of this. Anyways, it is nice to see you as an actual account!