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The text tool is the icon that resembles a "T" in the toolbar to the left. Click this icon. Use the drop-down menu next to "Character" at the top of the screen to select a font.  Use the second drop-down menu next to "Character" to select the format (i.e. regular, bold, italic, etc).  A traditional font such as Times New Roman or Garamond can add a formal look to a logo. A sans-serif font such as Helvetica can add a more modern look to a font. Avoid using overly decorative fonts that are difficult to read.  Also, avoid mixing fonts in your logo design. If you download free fonts online, be aware of the licensing agreement for those fonts.  Many free fonts are free to use for personal use but are not authorized for commercial use. With the text tool selected, click anywhere on the artboard to add a text cursor.  Then type your text.  Consider adding a separate text object for each word.  Especially if you plan on using different colors or sizes for different words in your logo design.  Don't add color to your logo just yet.  Color printing might not always be an option.  Designing a simple black and white logo to start with will ensure that your logo looks good in it's simplest form. You can also use the Text on a Path Tool to add text in a circle or curvy shape. Double-click the text to highlight it.  Then click Character at the top of the screen to display the character adjustment menu.  Use the following steps to adjust your text in the Character menu.   Font Size: The drop-down menu with a small "T" next to a large "T" adjusts the font size.  You can also use the selection tool (The icon that resembles a black mouse cursor in the toolbar to the left) to change the size of your font.  Leading:  Leading changes the space between lines of text.  Use the drop-down menu next to the icon that resembles an "A" on top of another "A" to change the leading.  Kerning: Kerning adjust the space between specific characters.  To adjust the kerning, highlight the characters you want to adjust and then use the drop-down menu next to the icon with an "A" and a "V" being pushed together in the character menu to adjust the kerning.  Tracking:  Tracking adjusts the space between all characters in the text.  Use the drop-down menu next to the icon that resembles an "A" and a "V" being pushed apart in the Character menu to adjust the tracking.  Horizontal Scale: Horizontal stretches the characters horizontally making them wider or thinner.  Use the drop-down menu next to the icon that resembles a "T" being stretched vertically in the Character menu to adjust the horizontal scale of the text.  Vertical Scale:  Vertical scale stretches characters vertically making them taller or shorter.  Use the icon that resembles a "T" being stretched vertically to adjust the vertical scale of the text. The font you select for your logo may not be available on all machines.  Once you get the text set the way you want it, you should vectorize the font.  This transforms the text into a vector graphic instead of a text object.  Be aware that you will not be able to edit the text after it has been vectorized. Use the following steps to vectorize the text:  Click the selection at the top of the toolbar to the left. Click the text object. Click Type in the menu bar at the top. Click Create Outlines.

Summary:
Select the text tool. Select a font. Add your text. Adjust the size and spacing of the text. Vectorize the font.