Talon is a badass assassin ready to rip through opponents with stealth and blade attacks!!!
First build is a roamer talon that is good for 5v5 if played correctly and second is a basic laner that can be played quite easily.ENJOY:)

Red desolation standard ad meelee rune;
Yellow m/5/lvl because you will be spamming your abilities a lot;
Blue cd for more rapid slashes and combos;
Quints ad for a little boost in early lvls;

21/9 for maximum dps and you can replace the lvling talent but i like it there.

Get all 3 then max rake, cutthroat and last noxian diplomacy...and ofc the ulti:))
Rake is your spam skill and you should use to harass
cutthroat->noxian->rake is killer combo, or cutthroat->ulti->rake->noxian finish if u need too much dps:D

BUILD 1: roamer(harder to play)
for starting with more ad for harass, life and lifesteal for sustainability;
nextfor more movement, or rushand then;
nextfor ad and move if you can sustain 20 stacks;
nextthe 1337 item for ad&cd;
nextfor defence and works great with passive;
nextsince you will have extreme ad and op crits;
next either maxfor dps or selland getfor lifesteal/ad
and the build is complete!!

BUILD 2: laner and more sustainable through mid game
is best starting item for talon;
for mobility in and out of lane;
or(depends on the farming output);

afterandgofor health that will be a blessing in late and debuff;
then makefor epic criticals;
last makefor atk speed and armor reduction or maxif you like;
afterandthe build is complete and you can literally deal a heck load of damage and gank really well;

I go Flash/Ghost since everything else doesn't help
Getting heal might help out if you are new player;
Ignite or exhaust might help with catching up or ensuring you get the kills, best replace ghost with them.

In order to be a roamer you need to be ready to go from one lane to another to gank.
I recommend leaving your lane immediately after you make occult so you can start the ganks.
If farming is going well and you rushed occult, i still recommend waiting until you get ulti:D
In mid you should already have malet and you should resist some damage during team fights.
In late you can already deal loads of damage if you have lots of stacks but beware tanks with health over 4k-5k cozz they can take a beating and 1-2 ccs will surely give them enough time to kill you.

While laning try to play defensive until lvl 4-6, but don't miss the chance to spam rake. at lvl 6 you can rush in with your laning partner and use Cutthroat->ulti->run in front of target->rake ->noxian diplomacy finisher or put in another noxian diplomacy before ulti or rake but target might have time to escape.
In mid phase you are already quite a hard to kill target and you should deal enough damage to solo everything except tanks. Try focusing on ranged and low-life meelee because they drop instantly if you use your combos correctly.
In late you have a little less ad than the roamer but you get the arp debuff from cleaver and more attack speed so you are better against tanks.
Also, expect some assists especially if you are playing with meelee fighters in your team because your burst doesnt always kill and then autoattackers finish off targets:D