Alright this is how I have started to build and play Evelyn Jungling.
I am not going to go through and explain the skills since, if you are looking for a build you should know what her skills do.
Alright once the game start's you will buy 1x cloth armour, 5x health pot's, and head to your 2 tower and WAIT before heading to blue buff, yes WAIT until you see poeple in there lane's, this will keep you from getting ganked and getting flamed from your team, With hate spike, the rune's above, and potting once you first get hit you should take the buff with 1\3 Health left.
After the golem, Head to wolfcamp and grab a point in Ravage, kill the wolves(big one first) Head to the wraiths, Pot before you get there, Ravage the big wraith and spam your Q, After this if somebody need's a gank or you can see a possible gank grab your W and head to that lane, If somebody does not need a gank or there isn't a possible gank grab another point in ravage, or Hate spike if your having trouble's.
Once you finish the 2 smaller golem's you will probaly be ready to go back if you have dont a gank, Grab madred's razor(Wriggle's if you managed first blood)
Another tip if the enemy team has a jungler, Ward Dragon and there Blue buff, which you should do anyways but this sets up for a easy buff steal or a kill also. If they have a jungler be very carefull trying to get into there jungler evelyn isn't the strongest jungler to try and fight off others without her stun from a gank.
Items okay the items I have put about you would most likely not finish, The reason to hexdrinker is it gives you some armour, might help with the squishyness of evelyn, the dmg, and the Shield I dont know how many times I played evelyn before this item came out where it could of gotten me many kill's.
A tip when playing from a gank, Always stealth before you get there and Use your Ravage from Behind them and get a stun, while minusing there armour and start spamming your Q, Use your ultimate if you have it for a attack speed bonus and a movement speed bonus. If you are low hp but are level 6, Fighting in a lane that you are ganking and you are about to make a kill Do not Run away to try and live I REPEAT DO NOT RUN, if you get the kill or assist, your ultimate's passive will give you health to either keep fighting or then you can choose to run.
Alright leave comment's below or ask any other questions about this evelyn guide! =] Have Fun Ganking!