As an archer I recommend:
- Go down the right side of the archery tree for Full Drawn. Also get Long Shot. Don't upgrade anything.
- Go down the left side of the stealth tree for Evade.
- Get Poison + the upgrade in the poison tree.
In total that's 10 points.
So. The plan is:
At level 5 you got 6 skill points, or 7 if Human, if I am not mistaken. 2 of them are already located in Stealth and Long Shot. So you got 4 points. That's enough for Full Draw in the archery tree.
The next 2 points(ala. level 7, or 6 as human), go down the left side of Subterfuge for Evade.
The next 2 points into Poison.(Level 9, or 8 as human).
This gives you:
Long shot - Good damage, low CD, low cost. Get some range and watch it hurt!
Explosive Shot - Good CC. Use it to knock down a target, or multiple if they are clustered.
Full Draw - Your initiator. At level 5 I hit for 1k damage with it. At level 9 I hit 2.5k with a crit. It's sweet 
Stealth - useful for sneaking around. Use it before Full Draw for more damage! Also useful to lose aggro from enemies.
Evade - Your movement skill. Useful to avoid enemy attacks, to get out of a charging attack or get out of a terror demons AoE.
Poison - It deals decent damage. Upgraded you also get a 25% increase damage. I believe that i 25% increase for all damage. That is huge!
From here on go down the right side of the Poison tree for Looked like it hurt and Cheap Shot. That should help with stamina. That requires 3 point, so that means level 12(11 as human, or 10 if you get the free skill point in Crestwood!).
Now you should have you specialization and work on that!