To apply for DACA, you will need to fill out the USCIS form I-821D. You must also fill out the forms I-765 and I-765WS to request a work permit. (You must demonstrate an economic need for employment in order to receive a work permit.) Make sure to use the most recent forms, otherwise your application may not be processed.
You will need to submit documents with your application to prove that you meet the eligibility criteria. Here is a checklist.
If you have been convicted of any crime or have been in a gang, it is good idea to get legal advice before applying for DACA.
If you are in USCIS proceedings or have another USCIS application pending, it is a good idea to get legal advice before applying for DACA.