as much money u get, faster u will rule. in the beginning try not to die or kill, unless u`re sure you WONT DIE. As much time u spend dead, less money. As we say TIME IS MONEY. so... u will start with the infinity edge with is awesome to have some kills in the beginning and will help u A LOT in the end of the game. do exactly what the build says in the items way. in skills i think u`d start with sonic wave, but if u don't think so, just don't do it.. i did that build to show u a better look of Lee Sin, a FAST AND STRONG KILLER! so good luck! any questions just ask!

i think those summoner spells, teleport just help u getting to the battle faster and help u moving to a better location for u, maybe a large mob of minions ;P
in the exhaust i think it helps killing some escaping bastards when your tempest/cripple is not ready.

STAY BACK AND BE READY FOR SURPRISING ENEMYS! thats it.

i`ve played with that build of my own fist and i really sucked.. i got 3/13/5. after that i re-organized it and i got 14/3/5 and i`m getting better... so i think u can really go well if u just try to re-organize it to your way to play.

i got a really good score without boots.. so i think some people may dont like it so just buy a boot and take any of those items u want... its a build but u can change it and make it to your way!
REMEMBER THAT> builds are just examples of ways to play with and character! do by your way IT WILL BE LOTS BETTER!