A break down of how to build an archer, and when some problems occur.
You start off with 2 abilities at level 1. Humans get 1 extra. so at level 1 we got 2 points. You end haven at level 3, meaning we start off with 4, or 5 as human.
2 of these are in longshot and stealth. We want that. So that leaves us with 2, or 3, points to start with at level 3.:
The first 4 points(level 5, or 4 as human) into Archery right side. Upgrade nothing, get Full Draw.
The next 2 points( 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) for Poisoned Weapons and it's upgrade.
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 and give you some crit chance. That requires 3 point, so that means level 12(11 as human or get the free skill point in Crestwood!, level 10 if you are human and get the amulet!).
that's the core of the build. Next up you work on your specialization, and eventually get upgrades for Longshot, explosive shot and Full Draw. You should also get Ambush at one point. This all account for 4 points. Note that there is at least 1 more free skill point to get(in the fade), so that's 3 levels!
You could also go down the DW tree for Dance of Death and Bloodied Prey, which requires 4 points.
How thing works:
At level 5: Stealth - full drawn. You can easily hit for 1k, and crit for even more. If enemies are cramped up. explosive shot for some CC. Use long shot in the meantime, but remember to keep yourself at least 15 meters away for the 600% damage bonus!
At level 9: Nothing really changes. You don't got your specialization and you don't hit harder. Your stamina is struggling since you lack crit, and the right passives. At this point archer feels weak, and is a head below everybody else.
At level 13: The core build is done, and you got some points in the Specialization of your choice! Better gear can be crafted. You are now feeling very strong!
At level 20: As an Artificer, you melt everything. As a tempest, thing doesn't even get close. As an assassin, things explode. You look badass, you do insane damage, you got mobility and you can see sweet, sweet, crits of up to 12k on a regular basis!