This should have atleast a lil bit of guide to it so here:
basic combo that i found worked the best in 1v1 combat or just to get a quick kill is
Q-->R-->W... usually that did it
every once in a while a E to start or finish worked well

W-->R helps get into combat fast


ABP is important for leblanc due to all her abilities using it but more importantly Cooldown and mana regen are key to staying in combat

hope this helped a lil. Enjoy

K so my wife bought leblanc and asked me to play it for her to learn what it did..other then 1 test match i had never seen leblanc in combat before. So i was still working kinks outta the slapped together mess i did in the bot match.

started strong with amp tome waiting to get kag'e lucky dagger...looking at my score now prolly shoulda gotten a mejai's but to late now. with fiddlestick we laned top against jax and akali

started kinda slow nothing special when jax jumped out and we rolled him pretty quick before even 4th lvl... akali barely made it away after
The match kept going in the same manner both mid and bot holding their own even getting good kills as well. alot of back and forth with me and fiddle basically flipping coins to see who we would get next.

at about 10 minutes MF ran up and got herself a fiddle kill and a death and the lane hopping began. was very quick and jst ownage amongst my team...me with an 11-0-11 before my first death. morde and ryza both having a double digit kill and assist as well. The forfeited at 38 mins