Can someone still help me with 2018 taxes on 4-15-2019?

I started it, but I don’t know my deductions we can still use. I have a college 21 year old son and an 11th grader. We had to pay our health insurance in 2018 plus homeowner and purchased a new car in 2018. Please let me know if tomorrow 4-15-2019 is to late for y’all help?