Is this correct sentence? please confirm

[charnita]

Have you done your homework? If not first complete your homework then play

 

[Raymott]

Have you done your homework? If not, first complete your homework then play.

You could possibly use another comma after the second "homework".
(No one here is likely to tell you your sentences are correct if they don't end in some form of punctuation.)

 

[Rover_KE]

charnita, please note that a better title would have been 'Have you done your homework?'

Extract from the Posting Guidelines:

'Thread titles should include all or part of the word/phrase being discussed.'

You could change the second 'homework' to 'it' to avoid unnecessary repetition.