Quick Start Guide
Oh, how exciting... you're about to do some brainstorming! I love coming up with new ideas, so I'm going to quickly show you how I use these cards. That said, there are many ways to skin the cat. So, your approach may be all together different. This should get you started though.
Step 1: Gather Your Tools
I find standing up and putting my ideas on a wall to be most effective. Your mileage may vary, but use sticky notes seem to work really well if a whiteboard isn't available. Just make sure you have a way to fire off ideas and iterate quickly.
Step 2: Shuffle The Deck
You don't want to use the same technique over and over... probably. Make sure the brainstorm deck is ready to rock when you need it.
Step 3: Start Listing Ideas
Any time you begin a brainstorming session, you're probably going to have a number of thoughts that are already in your conscious awareness. Sometimes these ideas are decent, but they probably aren't your best, or you wouldn't be doing this in the first place. I like to start with a giant brain dump to get all the surface stuff on the wall right away. Once that's done you can start diving deeper, which is likely what you want anyway.
Step 4: Use The Deck When You Get Stuck
Once I've been at it for a bit and I feel like my progress has haulted, I like to use the cards to start me in a new direction. Just pick a random card and do what it says. Even if you think it's not applicable to your situation, see if you can find a way to make it apply. The whole point is to force your brain into new paths and directions.
The cards won't hand you ideas, but they will (quite often) spark a new connection that allows you explore mental angles you hadn't even considered.