Brush it in whatever way you prefer. There's no right or wrong there.

You're taking a very deliberate and active role in your beard, and that's good thing. Just letting it grow is completely natural but, as with most anything that's worth doing, working at it and understanding what's best for you is important. You'll soon have a great beard that will have a lot to show for all the work you put into it.

Cheers!
Tom


Some helpful links:
Library Central of Beard Growing


Taming the Wild Mustache
Tips for eating and drinking with a big mustache

Excess on occasion is exhilarating. It prevents moderation from acquiring the deadening effect of a habit. ~ W. Somerset Maugham
A jerk with a beard is just a bearded jerk, but a bearded gentleman is awesomeness personified. ~ Triibeard