Concrete footings question...
Easy! Visit Quikrete.com. Select the RED link (the fast-setting concrete mix), and go from there. At the bottom of the RED page, you'll see links about installing posts. Yes, you pour it in a hole and add water. It can't be any easier. I use it all the time. DO read the directions first BEFORE you even leave the store to be SURE it's what you want to use. Keep it away from water and moisture until you need it.
Be sure to dig down below frost line. Buy yourself some gravel and wrap it up in some Landscape Fabric, and put it in the dugout hole BEFORE you add your mix. (It's for drainage under there.) AND, if you can, flare-out your hole like an upside-down icecream cone. That way, the cone CAN'T move UPWARDS, at all, because of its shape.
My best to ya and hope this helps.
Jay J -Moderator