Help with templars in general.

Hey guys, so I started playing this game when it became open beta and this is my first time playing a game of this genre and I'd like some help with templars.

I'm a 2h templar (level 38) but I use lightning skills like lightning strike, arc, but fire skills like firestorm equally. From what I observe, people like to focus on one element. I have about 600 hp and 150 energy shield, equipped with a death song double axe. My other equips are heavily focused on energy shield, relying on my passives for armor.

my Passive tree is http://www.pathofexile.com/passive-skill-tree/AAAAAgUABLMFWw9UFE0WQBo4KU8t0jKJN0c62ENjRHJG103YV-JY9V3GYG1mnmuscU165n1TgpuExIV9inSK5IuMjHaaz5vsncSiAKlotoa3Md0F3fPhc-w47SDyzg==

I'm probably doing a lot of things wrong and I'd like someone to point me into a general direction what most people like doing for templars.

Much appreciated.

Thanks!