Showing the $ value difference

Hello,
I am using Excel 2016.. and need some help.
I am doing a budgeting sheet and cant figure out how to do the following;
Column A - Budget $
Column B - Actual $
Column C - +/- $
I would like Column C to show the dollar amount as well as a + or - if the value in Column B is less than or greater than the value in column A.
I would also like the color to be green if - and to be red if +

Please help :)