Laning as Brand support is not as hard as it seems with your main focus being on doing damage and keeping the enemy low. You want to harrass the enemy with your W and E, and look for stuns with Q when available. Try to avoid hitting minion waves with W because Brand's high damage can mess up the wave for your ADC. The only time I'd recommend throwing a W on the wave is when you are looking for a cheeky E to reach an enemy. Don't underestimate his E ability, because it can be used in many different scenarios for you.

Team fighting as Brand is simple. Do as much damage as you can before you die - because you will die. If you get your 3-ability combo off PLUS your ultimate ability before you die then you did your job. Of course target the squishy targets because those will be the most at risk to you.