If you have the liquid yeast, and the capability to make a starter I would strongly suggest doing so.
That said, Wyeast 1056 is an American Ale yeast strain, you probably wouldn't be too far off if you used some Safale US-05.
I'm not sure how to make a starter, I'll do some research on that. Being my first brew ever thought dry would be easier. A starter probably requires some time and I have no idea how long the process will last.
Honestly, I used liquid yeast without a starter on many of my first brews. Never had a problem. Just follow the steps listed on the package. I do use a starter now though, since it is recommended.
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Drinking: Store Bought
Bottle Conditioning: Band Aid Hefe
Secondary: Air
Primary: Austin Home Brew Blue Moon Clone