Well, why not begin with 60 attack, 70 str, get members with some quests done i.e. monkey madness, if you have decent cash, get a bit of prayer, then perhaps work on 70 range (I'm assuming you want to keep relatively low combat with 1 defence)
I recomend you just do as you feel, have a basic outline like I am slowly becoming a rune pure but doing alot of skilling first, just do what you want at the time