The idea of this build is to be good support for your bottom lane. (I know, its wierd to not have Ashe solo-lane, but trust me on this one.) As long as you have one other good DPS champ on the bottom with you, you shouldn't die, unless you just dont know what you're doing. This is a basic build, but you hit hard and fast. Which included with your slows and another DPS champ you will take enemies down fairly quickly. The order you purchase the items in doesnt really matter, but I would suggest the boots first, then B.F. Longsword. Then you can buy pretty much anything else in any order. It takes until mid-late game to have the build fully complete, but once you do you will be nearly untouchable. You will be very quick, but if you do get stunned or snared, expect to die unless flash is off CD. If you'd like, you could even switch out one of the summoner spells for Cleanse, increasing survivability even further.