for the start...you unlock "light binding" dont waste your mana from the start try to farm without mana...well your 2nd move "lucent sigularity ...dont push if the opponent haunt you down...try to be under the turret....sometimes opponents confused themselves when you are low hp....you can press "b" and if you see they are coming for you be ready for the q ....turren and you ...its an easy kill....when you unlock the ultimate move try to be patient....when you can have a clear target use q,e,r and then q if the opponent is not dead and then w and e and you are ready to go back with a kill ...if you have fill opponent wait to have his 3 jumps and then press q and make your moves summoner ;) ! katarina also you have to be careful....dont waste mana and be patient...be prepared to press q when she comes close to you . Be always prepared for the opponent jungler by using wards or have your q ready

take blue if you dont have a jungler in your team otherwise try to farm well

lux is a very good and easy champion but also deadly ...

take first item doran ring if you want but i start always with ablyfing tome and then i ake a mana potion or the blue buff. after this take the boot and then "fiendish code"...you need 40% cool down it helps a lot to have soon your ultimate. finish the "athene's unholy grane " and then take the ionian boot... you will have 20% cooldown and this is good for start . 3rd item "catalist the protector" it will give you mana and health when you level up which is very helpful for you...you barely loose mana ...finith the "rod of ages" and then start the "death fires grasp" stast with "fiendish code" to get 40% cooldown and then the "needlessly large rod". Well obliously you have health but you need more ...you can take the "rylai's scepter" and the last item rabandons death cap.... you can reverse it ,take 1st the cap and then rylai's.... and this is your full build ;) gl