The next few months will be useful to find out financial realities, can your family contribute to college costs with your sister in college as well? Does family income qualify for Pell grant, NY state grant? What EFC does your sister have, what aid does she get?
And do test prep, take some practice tests. Kaplan has free PCAT prep I think and Khan academy partners with Collegeboard for SAT prep.
You need to know these to know which schools might be matches, safeties, reaches.
You will apply in late summer/fall of senior year and the FAFSA will be available to file around October 2017 as well. 2016 income will be used, tax returns should be done by that time.
But net price calculators can be helpful for early estimates.