It sounds like this is your first character so I am going to go a different route from some of the other posts above.
First off with the pure strength verses the 70:70 build. each has its pros and cons.
Pure strength = less damage dealt but more health(harder to kill)
70:70 hybrid= more damage dealt but less health.
This is how the game is balanced. You have a choice being able to survive lots of hits and doing less damage. Or dealing more damage and dying easier with lower hp.
The tried and true build is pure strength, you are guaranteed not to suck but some people have very succesfully pulled off hybrid builds.
This is the easiest archer build.
Its easy because it requires the least amount of sp allowing you to level quickly.
In my opinion grasswalk is one of the most important skills you can have. It allows you to run fast and chase down enemys or runaway from certain death. It saves you lots of time in everyday grinding running from mob to mob.
So
If you are not sp farming then in my opinion you should only do 2 skill trees, 1 weapon 1force.
Stick with lightning and pacheon trees.
true fire does alittle more damage at first but the lightning magic buff will compensate at higher levels.
Ice is great against monsters but against other people at higher levels you will be at a disadvantage because it is relativly easy to be resistant or immune to freezing and ice does the least amount of damage compared to fire and lightning.
Read the archer build and Alfreds healer guide
http://sro.mmosite.com/guides/index.shtml
This build will not make you the strongest but you will be able to hold your own without having to farm 200sp.