need a good PVE build bad
30/0/0/10/10 is a very solid starting point:
http://en.gw2skills.net/editor/?fcAQJAqelIqiY3zyuF17IyoCdmoC53nHvVaBhA-e
With 10 points in Alchemy and Tools you have permanent Swiftness and Vigor, the former is good for open PvE, the later is good for dungeons, especially if unfamiliar with the dungeon/boss. 30 points in Explosives enables you to use both the Grenade Kit and the Bomb Kit.
The Grenade Kit is very good at inflicting Vulnerability and to do damage when close range combat is too dangerous, the Bomb Kit is used for melee range (e.g. if the enemy has reflection) and for fire fields which you can use for Might via blast finisher. The Bomb Kit itself, Elixir Gun #4, Shield #4 and Detonate Healing Turret provide the blast finisher. Elixir Gun is also useful for the condition remove of #5 and the Cripple/Swiftness of #2. The Healing Turret, once you’re making use of its water fields, provide almost equal healing as the Med Kit but has more condition remove and party heal so I prefer it.
You rather free spending your last 20 points, I spend them in Tools to get 10% more damage, more crit damage and Tool Belt skill recharge rate.
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After the next update in December you properly want to use this build:
http://en.gw2skills.net/editor/?fcAQJAqelIqiY3zyuF1rICoH1FAMife8WpFEC-e
The last 10 points go either into Alchemy for permanent Vigor during fights (with Firearms III) (more of a dungeon build) or Tools for permanent Swiftness outside of combat (more of a open PvE build).