dont believe the hype, your stats will noticeably effect your gameplay. That said, they made it so even if you have nothing, you can get by on gear, but you will be noticeably weaker than some one your level.

Stats right now is fairly complex, i reccomend as someone said, playing around with it yourself.
some things to keep in mind
your stats effect is capped per rank, for example, lets say you have 160 vit at level 1, you will probably only see the effect of 40 or something like that. (maybe this changed, but this was the old info they had early)

the exact effects are unknown, but
str is physical dmg related
int is magic dmg related
mind is mp and magic defense
dex is accuracy and evasion
vit is hp and physical defense.

stats arent going to be as effective as direct bonuses, like items that give attack, evasion, defense accuracy directly. These are the most effective means of increasing your output, but they will have an effect.
Difference between your level and the monsters level will reduce or increase whatever effects your stats generated. IE if you can do 120 damage to a level 40 rat in one hit, if you fight something higher, with the same stats, it will cut your damage by a %, but if all your gear sucks, you would have been doing 80 to that same rat, and for the higher monster that would also get cut.



looking at your post you may have just wanted to know what ratios to go for for archer, I would focus on dex and strength, but there isnt that much advantage to completly ignoring your other stats.