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Check out an app named "forScore" in the App Store. I downloaded it the other night, currently costs $4.99 but it rocks (at least for what I need it for). You can keep your sheet music arranged by genre, composer, title, etc. Has a built in visual and audible metronome which of course is customizable.
You can also add your own notation marks to the sheet music (what I call my "dummy notes" since I'm new to reading music). I've mainly been uploading sheet music from PDF format, such as some of the music here on the Fiddlerman forum. It's saving me a lot in regards to printer ink and paper, plus it's all digitized and easily organized on my iPad.
Only thing I'm not sure of is whether you can create your sheet music from scratch using this app. Not sure if you need that type of function or not.