" got my first paychek from my new job"
In reply to your question.
Got, I was always told was slang so we weren't encouraged to use it, but we did anyway.
paychek, should be pay cheque, or pay-cheque. Cheque is the correct spelling.
although I note that a lot of countries are now using check instead of cheque.
As for the sentence.
I just got my first pay cheque from my new job, or
I just received my first pay cheque from my new job.
Take your pick.
Student or Learner