While I'm not the grammar/spelling police, you have lots of errors which make it not only distracting to read but in some places confusing. Secondly, the formatting is non-standard which is also rather distracting. It's good to get in the habit of writing in a professional style from the start rather than unlearn bad habits later. CeltX is free and could easily handle the script formatting automatically for you.
Getting the technical stuff out of the way, I think it was good until page 8. At that point, the dialogue and story issues became confused. You mention he smoked a cigar then later Steve notices cigarette smoke. Which is it? Blair comes across as very much an amateur. He should be able to pick a lock. Heck, if you go on YouTube you can see how to pick a lock. Using a screwdriver to climb through a window doesn't seem smart. Smoking in the vic's house also seems very amateurish. Especially if he picks up that it's not his brand. You've already established that Steve is also a hired assassin.
Next Daniel appears out of nowhere? He must have been affiliated with Steve if he was in that area. If Drake was trying to make a message of Steve, it just seems odd that Daniel would simply invite Blair into his car rather than bump him off. Tit for tat. However, once inside the car, the dialogue becomes nightmarishly dull and rambling. Then we see the bar scene. WTF? Then we move to the diner with Ruby. That's the end? It doesn't make sense to me. After page 8, the script loses its story. Please, the use of voiceover on p. 7 is totally uncalled for. You could shorten it and put that into the bedroom scene.
I'd also make changes to the scene. A scene has to have a purpose that drives the story. If it doesn't, it shouldn't be included. You want to minimize the number of shot locations to be essential to the story. Below is how you could repurpose page 5. Notice it is "lies" not "lays".
Code:
EXT. STREET - NIGHT
Blair leaves the party and walks up the lonely street again. He
takes an alcohol canister out of his jacket pocket and gulps on
it.
EXT. APARTMENT COMPLEX - NIGHT
Blair walks up the stark staircase lit by naked lightbulbs. He
lumbers to a door, drags a key from his pocket and fights
through the exhaustion to turn the locks.
INT. BLAIR’S BEDROOM - NIGHT
Blair *lies* on his bed, sleepless as he stares into the ceiling.
BLAIR (V.O.)
Nothingness fills my days, routine the
bread I eat. Change is my enemy it
seems.
He gets up and lumbers towards the bathroom.
INT. BLAIR’S APARTMENT TOILET - NIGHT
Blair splashes a handful of water against his face. He stares
into the mirror, his face like a zombie, dead and cold.
Opens a cabinet case and forcefully swallows vitamin pills like
they were the cure of his life.
Placing his palms on each side of the bathroom sink, he looks
ahead, seemingly into the drain hole.
The mirror reflects as he turns to dry his face.
The light goes out.
INT. BLAIR’S APARTMENT LIVING ROOM - DAY
The living room is a cluttered mess with mags ranging from
the dirty type to current news all over. Pairs of Marine Corps
boots are far in distance like they were slung with a catapult.
Empty cartons of cereal and sugars dropped where they were
opened and the stickiness on the floor has transpired from
the fall of an unsealed bottle of coke.
Blair moves about as if the state of his apartment were
the standard of all households. He puts on his jacket and
adjusts the collar of his raggedy jacket. He opens the door
and slams it as he rushes out.
Though honestly even here the voiceover isn't very important. And if push came to shove, I'd simply cut the bedroom scene. What does a guy with insomnia really tell me? By re-using the hallway, you can shoot the kids' scene and this night scene at the same time. You don't have to do a separate set up outside of the apartment complex. It's a practical consideration. Again, big run-on paragraph. If you're shooting this yourself, it's one thing. If you plan to do this professionally, be sure to always check spelling and grammar. One or two misses, most readers will forgive. But with two or more on each page, it is an immediate pass.
I think it starts a bit rough but could be fixed. But after he meets with Steve, it just quickly unravels.