The first place you need to go is here: https://turbotax.intuit.com/personal-taxes/past-years-products/ to get the past years tax returns. Turbo Tax will provides software for the following past years 2013, 2014 and 2015. Most people who have to go back further usually file by paper for the ones that they cannot get software for.
Start with the oldest year first to file, and do each year at a time.
When all past returns have been filed then you can start 2016. https://turbotax.intuit.com/personal-taxes/online/
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