If you have not prepared your own returns before, it's not hard, but I agree with the recommendation to seek out assistance, since the time factor.
For 2021, you would file a joint return, listing you and your spouse's combined income and deductions. If you want to buy Turbotax, you can download the 2021 version here. This is installed on your computer, it is not online.
Products for previous tax years
For 2022, you would file as single, unless you care for qualifying child dependents in your home, in which case you may qualify to file as "qualifying surviving spouse" which has better tax rates (but is only for surviving spouses who care for dependents.) You can buy the 2022 version of Turbotax to install on your computer from the same place.
For 2023, you would file as single, unless you can file as qualifying surviving spouse because of your dependents. For 2023 (the current tax season) you can file either using Turbotax online, or Turbotax purchased from the web site or another store like Amazon or Best Buy, that you install on your computer. However, the deadline for e-filing is October 15. If you wait longer than that, you must print your return and file by mail.
For all three years, there are no late penalties if you are due a refund. If you owe taxes, there is a penalty of 25% of the amount you owe, plus 1% per month since the return was originally due. If you owe substantial penalties, a tax professional may be able to help you negotiate a lower payment.
