Talon is by far my favorite midlaner. I just love his play style and his snowball potential. He can burst down any carry or walk away and let them bleed to death. I play very aggressive so he is a great champion for me. Im just going to talk about some combos and builds for talon and i hope they help you.

Start long sword for damage and to build into Youmuus. Refillable potion is my favorite for sustain. Talon needs lethality. Build youmuus then boots of lucidity, and then duskblade or edge of night for the MR. After that just build more damage if your ahead, health, MR, and armor if you are getting burst down, or Frozen Mallet if your just feeling like being an evil bastard.

Play very aggressive but make sure your not wasting mana. If they go for farm just use your w to get them and a couple minions. If they are dumb enough to go in just w, q, and then AA to proc your bleed. That by itself will almost kill them. I take exhaust for that exact reason, to slow them down and reduce their MR and armor. I dont know how many times I've gotten first blood with this. You will also want to gank bot and top as often as possible. Bot is the better option early game because you can just delete the adc or support. Go top if your jungler is busy or something and you know you can get their laner.

https://www.youtube.com/watch?v=Us-W3HSbIYI
By fiddlezahar 5.
this is the video i used when i first started playing talon it helps a lot to learn basic combos and then more difficult ones.