I have been where you are and am happy to share what I have learned. We all have more to learn.

Okay, TOC's aside: In your document, on the Home tab of the ribbon, three "blocks" over is the Paragraph section, with all the buttons for alignment, lists, indents, etc. To the right of the word Paragraph at the bottom of this, click on the small, diagonally downward-pointing arrow. At the bottom left of the Paragraph dialogue box which comes up, you'll set the Tabs button, which will bring up the familiar Tabs dialogue box.

Let me know if you have further problems.