I am new. This will under go a lot of edits. On a side note I have only been playing league for about 3 weeks now. I never played that other game that was the mod of Warcraft.

That said I am toying around with Ezreal. I love him! He has been the most enjoyable character I have piloted. I really enjoy the skill shots and the ability to aggravate whomever I am playing in the same lane against. I may be known for firing off Mystic Shots and shouting "Megaman!" or "hadouken!" in my local lan center...

Arcane Shift is an excellent skill that can get you in or out of a nasty spot. But, I don't feel its enough on its own. Augmenting yourself with one of these two is most definitely a smart idea.

Flash
Quick hands can save your life! There have been many times where my aggressiveness probably should have ended me and resulted in the enemies champion being fed. However this beauty combined with Arcane Shift have ninja'ed me out of many a hard spot. "Oh god that is a lot of them. Abort!" That said, I tend to not get that out of position and to be honest the cool down on flash is near painful. I recommend it for people who like to push their lane and head into no mans land.
Ghost StepGhost Step
Time to move! Sometimes we all like to either chase that summoner down or "Get the Hell out of Dodge. Sadly, getting ganked in mid via the river or random jungle route seems to be the more likely of those two. I prefer ghost simply for its reasonable cool down and running away ability. Personally, I want to get the most out of my Summoner's Insight. So I tend to take one of these two.

Teleport
Get back to that lane! This is pretty straight forward I believe. You want to stay in your lane as much as you possibly can.
Promote
"Make my monster grow!" Terrible childhood reference aside, eventually you will want to take down towers. Being on mid that task will fall to you alone to do. This little turbo minion can help you get the job done.

Mystic Shot
You are Megaman! You will use the hell out of this! This your everything. You can do what I do and cheer yourself on calling each of your shots out. Nothing makes me happier then antagonizing the opposing champion and announcing it as I do it. It is satisfying to the say the least.

Arcane Shift
Wait I get a free Teleport!? Normally you should save this as your escape. However you will be called upon to play aggressively. You can easily use it to line up your Mystic Shot. It will blind side squishier champions and those out there that hide behind their lines and sponge. Nothing like saying "And eat that chunk of damage... You better hide behind those minions!"
Trueshot Barrage
Reach out and touch somebody! So what is not to like about limitless range that can hit multiple enemies AND can blindside kill on a whim? In all seriousness this one skill has made me more aware of what is happening in my games. I pay way more attention to the other lanes. I stack up kills and assists off of helping teammates start an assault or popping that silly champion behind his turret while they wait for their potions to kick in. The other use I tend abuse is farming an entire lane with a well place shot down the center. Mid to late game it kills or nearly kills just about anything minion."And now even those minions won't save you!"
Essence Flux
It does something?Since the August Patch this skills value has significantly dropped. I am grateful they made better to compensate and such. I really agree to the patches change to this skill. Now that said it is a skill that you can use on multiple champions. It also can be fired across the minion line. My issue is it the mana it burns up. I would rather just use that juice elsewhere. "I wish it was just Mystic Shot again!"

Sheen
Passive Ability Boost! It makes your Mystic Shot better. And anything that makes it better makes YOU better. It also builds into Lich Bane . In games I have been doing exceptionally well I will actually just rush build it.

Sorcerer's Shoes or ionian boots of lucidity
Your gonna have to choose one. I feel this is acutally purely a preference decision. I tend to play for the late game sniper. So I roll out my Magic Penetration!

Rabadon's Deathcap
Some people pray, I put on my wizards cap! It makes your EVERYTHING better. It is a fair chunk of gold but well worth every piece.

Archangel's Staff
Recharge! It is your Tear of the Goddess 's final destination. There is a sound argument to rush these items in a different order as well. I find this keeps me in the fight longer and harder.

Void Staff
Silly Enemies. So that other middle lane champion, and the random, poor, unfortunate champions to have felt your piking damage have started to defend against it. Have no fear Void Staff will effectively and painfully remind them that you can hit AND hurt them no matter where they are.