The gadgets that you add to your blog should be information and promotional.
Informational gadgets should give the visitor the information that the reader wants to know about your business, you and your products. Promotional should promote your business, you and your products. Sticking to these guidelines will help you stay focused in your efforts.
Normally, I do my blogger work using my regular blogger dashboard. The older version of blogger seems to get along better with Firefox. I get fewer, if any, error messages. Using blogger in draft becomes frustrating when you get the error messages and have to deal with a Blogger Group, and only a Blogger Group in an attempt to get help, which is rare.
Once you have signed in, access blogger in draft . Go to your layouts tab and then page elements.
If you click on "add a gadget" you will see a plethora of gadgets to choose from. There are way too many to mention here.
The Gadgets that best promote and/or inform include;
Many of these items allow you to use your imagination to use them in a different way that best meets your need. Take a look at them and they may help spark an idea.