Yes you can start an Online tax return now. But you can not file it until late January. And you have to wait to get your W2 from your employer and any 1099 forms. They have until Jan 31 to send the tax forms to you. What kind of income did you have? Did you work at a job or make self employment income?
Start here,
https://turbotax.intuit.com/personal-taxes/online/
