FIRST AND FOREMOST : KNOW YOUR DAMAGE.
So what you want to do is gank top lane at level 3, or mid if you can't top. This is why you start at the bottom side buff (or what I thought atleast lol). If you can't gank top or mid at level 3, check the notes in the abilities section.
Once you finish your buff, go take wolves. I don't know why but wraiths always take longer (and is bad if you start red). Get your second buff, but becareful of invade - especially if it's Dragon Fist or Traditional Lee Sin. Seriously. Use your trinket if you must. If you got your buff without trouble gank top; it should be about 3-3:10 when you reach top river brush or tri. Becareful - the other jungler could be there. Do not wait long - this is a waste of time (which is a waste of xp too). Gank as soon as possible. I suggest ganking top/mid alot more often early, as the ideal ratio of allies to enemies are better (2vs1 vs 3vs2). If you burnt a flash for someone like Pantheon, Darius, Twisted Fate ; Camp the shet out of them!

This is your power spike or whatever they call it. This is when bot lane plays your part. Try to win their lane at around min 12. It's a bit early to declare it mid game, but it is important as it is a good time to get dragon.
Step one : Let enemy bot push
Step two : Gank
Step three : Drag, or repeat one and two if you failed
Step four : ???
Step five : Profit
IMPORTANT : If your mid lane is failing badly and you are doing well; do NOT give them blue buff. Disregard their flame if they do; you can do much more with it than a 0-10 Syndra. I believe NB3 said something like this.
Mid game (~20 min) is where you need to take the map and take objectives. This will give you more opportunities and reduces risk... for doing risky stuff?

do i have to? i g2g lol.
--- SIDE TIP : PUSH SOLO LANE - TRY CATCH ONE OFFGUARD (Lucian wants that wave... catch him (W, auto, Hydra, Q, ult or auto, E for his pursuit, just kill already)