It actually seems pretty good, dude. I mean, I suppose it's too early to tell what type of story it'd be, whether it's a drama, a comedy, a bit of both. But so far the scene seems alright and well written. You've made it quite clear which characters are speaking and when and you've established the setting without going off on a tangent. So no worries, you're on the right path.
And as for getting the story to go where you want it to go, I find that it helps to have an outline of the plot so you don't lose track and have some sort of goal. I assume you've already got an ending in mind (it's okay if you don't)--and if you do then it'd be good to take notes, write down ideas that come to mind that can be used as sub-plots, twists, things that can move your story along and get to your desired ending.
Of course, it's not necessary to rely heavily on the outline as this can kill your muse and that's the last thing we'd want as writers. Have a structure but be flexible as well. If something doesn't feel right or if you find your characters not acting like themselves, feel free to make some changes. After all this is your story and you need to listen to your inner voice too.
So yeah, just my two cents. Again, from this extract I think you're doing well so keep it up and good luck with the rest of your story.