First of all for the beginning items I usually go boots, 3 health pots if your laneing opponent has a lot of skill shots examples: Ezreal,Brand,Ahri,Swain,Gragas,Morgana,and Lux,Etc. If your facing an opponent that has no skill shots then start Doran's Ring Example: Ryze,Fiddlesticks,mordekeiser,Etc.

If your team doesn't help you in team fights you will doe really quick cause your a burst squishy Champion. Teamwork is the key to be successful with Leblanc.When team fights happens be in the back to burst a champion down quick so u can get away with out dieing.If you team fails to protect you you'll be useless in the end

Leblanc is hard to farm with if u don't know how to farm well, my suggestion is to play a couple of co op vs ai to get use to her auto attack style it will come in handy in the future. Plus a Farmed LeBlanc is a happy LeBlanc

If you want to know the item build go to that area to look at it all i have to say is the last item is situational to what you and the team needs