Hi and Welcome!
If you want to go fully ranged, using Detheya's Set is a must as it's develloped for rangers.
You can increase your damage and resistances by using the blacksmith arts giving better attack and defence ratings. (I believe I have a 50 / 50 setting for that) Any remaining slots you can full up with jewelry giving better attack and defence as well.
Use rings giving higher damage - personal preference: +X% physical - in your bows. Whenever possible, try to find rings giving +Y LL as well. A full Detheya's set gives LL as well, thus making your char almost invunerable.
Best choices of extra damage are fire and ice, although occasionally (like with the G'C and a few dragons) poison helps as well.
And finally: Make sure you got one or two slots equiped with throwing stars / daggers and a shield. You'll need those to get extra protection in case the mobs get too close.
Another thing you might do is picking bargaining as skill - however you do need 5 points spent in EP for that - and buy the good armor and - more important! - weapons while journeying through Ancaria.