Start your introduction broad, but not too broad. ...
Provide relevant background, but don't begin your true argument. ...
Provide a thesis. ...
Provide only helpful, relevant information. ...
Try to avoid clichés. ...
Don't feel pressured to write your intro first. ...
Convince the reader that your essay is worth reading.
Some words are indeed notable for being good sentence starters. The list will include the following: although, I would like to, first, meanwhile, therefore, subsequently, while, I would like to, moreover, in general, in addition, furthermore.
Hope this helps :))