But the main thing IMO, as has been mentioned, is to get a brush stand.
There is actually no science to support this view. There are quite a few threads (search "brush stand" if you're really interested), and the consensus is always that the stand adds nothing to the longevity of the brush (unless you're hanging a dripping wet brush - which would be pretty crazy). The water evaporates through capillary action, regardless of stand or shelf.
But some people like the way a stand looks, so there is nothing wrong with spending more money than you need to - this is B&B!