Star has had a fair stab. Anyhow, here's my contribution, such as it is.
Don’t talk to me! = Amar shathe mathio na!
Drive carefully = Shabdane ghari chalaben
Good evening = Shubho shondha (shondha meaning evening)
Good morning = Shubho shokal (shokal meaning morning)
Good night = Shubho rathri (rathri meaning night)
Have a good journey = Shubho jathra
Have a nice day = Bhalo houk thumar (or aponar instead of thumar if you wanna be respectful) dhinta (nobody serenades me with this either
)
It’s nice to see you = Tumaray dekhya kubh kushi oiysi
Listen to me = Amar kotha huno (or shuno)
Thankyou = Dhonnobad
And finally, the big question.
You can try:
I'm waiting = Ami tu oppekkay acchi (he'll get it if he has an ounce of subtlety).
Or:
And in pure sylhetti:
Am I gonna sit here for you, forever? = Ami kita ikano boiya thakmo na khita tor lagi?
(You might wanna add hallar halla for the Snoop effect).
Though Star's effort is more direct and to the point.
Hope that helps some, Angel.
Don't worry, given a year at most, you'll be chatting better Bangla than most Bengali's. Once you start to hear it being spoken, it is easy to pick up.