I'm pretty bad with fiddle, he has to wait for a fight to start for him to be effective towards the end, and that can be hard to get right. idk if you have been picking up zhonyas but your ult will still do damage when you have it active, which makes it much easier to survive jumping into the other team.
never actually played them, im not sure if they are as strong as they were, it was that you would see her every other game... so no good advice really.
zhonyas is a must if you are iniciating with fiddle, i recommend spell vamp too, i know you get heath from life drain but its a good increase.
want to play today? and when. (in time from your post)
im going to sleep, i recommend you pick up LoL Replay, you can use it to see your games again, or other peoples, so it may help if you watch someone playing akali to see what they do.