See the dependent rules in link below for reference, but if your son earned > $4,050 and is not a full time student, then he can't be your dependent. Step through the interview process in the My Info section to determine your filing status.
Yes, If you son was under the age of 19 before December 31, 2017 you can claim the EIC credit as long has you meet all the requirements, see below.
To count as a qualifying child for EIC, your child must have a valid Social Security number (not an ITIN).
S/he must also:
Additionally To qualify for and claim the Earned Income Credit you must:
In addition, both your earned income and Adjusted Gross Income (AGI) may not exceed:
One more thing – if you're not claiming a qualifying child:
Phew! Got all that? Hope that helped.