Im a single mother of 2 children, ive only worked a few months throughout the year. How do I file my taxes to get the best return ? There father hasnt helped at all.

The children's father and I have been together for 5 1/2 years, we broke up mid 2015. He did not help hardly at all all year, He spent most of his money on drugs and drinking. So I finally made him leave, and he hasn't helped at all ever since nor seen them. We have filed our taxes jointly the past 4 years, but now I need to figure out the best way to file with both of my children. I have worked about 3 months of the year, my boyfriend has been helping me support the kids and what not. I do not have any W2's, but I do have all of my check stubs. I need to file as soon as possible so I can buy my children new clothes and everything else they need. Just have to figure out how to do this correctly and legally. Thank you.