One of the things you will want to do often is to add a text frame to your page. To do so, select the Text Tool from the Toolbox (the blue "A" at the top on the left), and then "draw" the text area on your page.

Having done this, you can adjust the size and position of the frame whenever you please.

To resize the frame, move your pointer over one of the "grab handles". The cursor changes.  When it does so, you can drag the handle, and resize the frame.

To reposition your text frame, move the pointer onto the frame's border, and the cursor changes to a Van with the word "Move" on its side.  You can now move the entire frame.

Try creating a couple of text frames on one page, and moving them around in relation to each other.  What can you do that you couldn't do in Word?