"I have not received any tax documents"

You should wait for the tax documents to arrive. However, in the interim you should be able to contact the  executor (id there was a will) or administrator (if there was not) and that individual should be able to give you some sense of whether the $3000 consists of any taxable income or gain.

You should receive a Form K-1 from the estate. How you report the amount on your return will be shown on the K-1.

The K-1 on the estate is normally due to the beneficiaries by April 15th of the following year. If you have not received the K-1 you should contact the individual that sent you the check to find out when to expect the K-1.

If the K-1 will not be received until after April 15th you can file an Extension on your return. See How to file an extension.

When you receive the K-1 you would enter it in the Income and expense section of the program. To enter the K-1 you should:

1. Find Search area in the upper right of the screen
2. Enter K-1 in the search box
3. Select K-1 Estates in the drop down menu
4. A question will come up Where do I enter my K-1? 
5. Select Go to K-1
6. Begin entering the K-1 information on the screens.