Hey, we all have to start somewhere. And passion is usually a good bet, which is great to hear.
Anyway, I'll give you some helpful pointers and critiques that I really think you can benefit from:
This is a good place to start. Okay -- forgive my ignorance of cars but: is a 1990 Chevrolet Lumina a Dodge Dart? I assume they are the same car, but that confused me for a second, because I have very little knowledge regarding automobiles.
And I'm sure I'm not alone here, but that's why you don't have to be that specific to name the exact car model and year if it doesn't hold relevance to the plot (I don't see any relevance in this script).
Oh, and you don't need a dash before every Slug.
Okay, stop telling us and start showing us. You're using far too many adjectives, and not nearly enough verbs and adverbs. It's bad writing -- well, not really bad writing, but it isn't 'good' writing. When you just write: Bob gets angry, or Billy looks sad, or Johnny is calm; it's not visual (which is essential in a screenplay), personable nor creative for that matter. It's easy to write like that. Anyone can, but you have to challenge yourself.
So more verbs and adverbs. SHOW us that James is anctious.
James twitches his leg as he quickly scopes out the house infront of him.
-- Well that isn't exactly the greatest either, but you can see the difference, and I'm sure you get the point.
Make it visual -- Make it read like a screenplay.
Wait, I thought you said Thomas was calm? He doesn't sound very calm to me -- at least that's the impression that I got. He sounded more paranoid and antsy than anything. First doubting the neighborhood, then snapping at James and then saying "I have a bad feeling about this."
Meh... it's just not very screenplay like. And I don't even know what the last line even means or refers to.
Again, the same problem over and over again. How easy is it to write "6 husky looking men playing a game of poker." That's such a cop-out, dude. SHOWWW US!!
INT. HOUSE LIVING ROOM - CONTINUOUS
Six large, husky men sit around a table, cards in one hand and their beer in the other. Poker chips, pistols and shotguns are scattered over and around the table.
I'll raise ya' $50.
EXT. BACK OF THE HOUSE - CONTINUOUS
Again show us...
Cut all the "we see" in the action. It's not needed.
Now it's your turn to guess what's wrong with the pervious action. SHOW US!! stop telling!
I hope this helps... and don't worry, those are mistakes we ALL made when starting.