Most web browsers only use a default font which is similar to Times New Roman. Other font changes usually don't work or they'll distort the formatting that you are so carefully trying to maintain. Instead use the format box on the extreme left located next to the font type box. Press the arrow key and select Normal, Heading 1, Heading 2, ect. Other methods are unpredictable.
Bulleted lists translate nicely and are great for lists of information.
Tabs are problems and look bad. Don t use them. Use a table if you must create a tabbed effect. Place one set of information in each column and press Shift-Enter to force a line feed. Use shift-enter when you don't want to double space after pressing Enter.