If it's brandy new it's probably fairly flat already. Sometimes stones can arrive with a glaze on them that doesn't allow the stone's grit to cut into the metal as well, so you may need to 'freshen' the surface up. To do that is pretty easy, you'll need a piece of glass you don't care about any more, needs to be larger than the stone as you will be rubbing the stone on the glass surface, which should be flat.
Get some fine carbide grit
seen here
Sprinkle just a small amount of that on the glass, you'll want to put the glass plate on a rubber mat to prevent it from moving around on you. Then take and sprinkle some water on the grit and start rubbing the stone against the glass. It'll show any high spots on your stone pretty quickly. And just a word of warning, this is a LOUD operation

my wife just hates this!
Also, while most will use oil, I've found it best to sharpen dry and wash off any grit from the sharpening process. It's a cleaner way, less messy to do too. To clean any metal that gets into the stone, you can do the carbide thing again, but usually you can get it cleaned off quickly with some lighter fluid
Here's my travel kit for sharpening, works pretty well;
Set of Spyderco Profiles, Spyderco DoubleStuff, Rust Eraser for cleaning the ceramics Leather strop, a small fine india and a combo stone with a fine india and a coarse section and a pound of Silicon Carbide grit for resurfacing the stones and lighter fluid for cleaning the stones. I've stopped the oil mess and no looking back!
got this plastic tub from Wallmart, it JUST holds the 1 pound of the Silicon Carbide grit it's varying sized but works well, just use a piece of glass and a little water and you're in business

That 1 pound will last you a life time! Don't wash off that glass when you are done, just leave that grit on there and add a little next time you use it.
G2