i've followed that guide for a long time (unless there is another one which is very similar), it used to say stack crit chance. And so I did.
If you stacked crit chance, I suggest starting with a vampiric scepter. I find that a better item to start off with is the executioner's calling. The scepter will let you last hit more agressively than the sword. Try to lane with a ranged champ, and last hit creeps only. If necessary, let enemies push near your tower.
If you die early, get the crit gloves, and you can nearly last hit all the minions with your crit chance runes + gloves. Just run around the minions, wait for tower to hit once or twice, go in for the last hit. This is easier with yi because your passive works really well to last hit early with the tower.
Once you get executioner's calling, it will be easier to put more pressure on your lane. Hit enemy champs, it will poison them a bit, and reduce their healing. With the exec you will also crit a lot, and you'll be taking a big chunk out of their HP (as opposed to razors, which will not help you as much in terms of lane presence.
Once you get execs and zerkers, you will be around lvl6-7ish. Jungling with exec/zerkers is just as easy as jungling with razor/scepter/zerkers, but with exec you will be more useful while ganking.
In the jungle, start with golem: alphastrike, wuju, highlander. Highlander recharges fast, so use it on golem and lizard. With golem, you can alpha strike + wuju all the creeps easily. Lastly get the liz buff, go heal if necessary and go gank.