Heyho, first guide and stuff--

Talon is an extremly mobile AD Burst Caster. Especially his W scales very good with ap, and as his Q is onhit, he gets super High sustain from Livesteal, because he doesnt only get the percents of his ad, but also the onhit dmg of his q . His e is one of the best gapcloser in the game, use it to jump on the Carries in the backline. His ult works fine with this, because 1st Talon jumps behind his Target, and 2nd you also do dmg to the frontline because your Ult's Blades slash through them too.
Your Combo is pretty easy:

R- (Youmoos, Flash) - E (strong short slow)- W (long weak slow but TONS OF DMG) - Q (Applie the bleed at the end so it lasts Longer) - Auto Attacks(for the tankier ones. The sqishys died already)

http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/2072891765/30793414?tab=builds

Here is a game with the build on my smurf (yes i know smurfes suck but - Hey he needs to get Gold, too)

All in All, even after the nerf talon is superstrong. SCHLIATZ!