I see on TV they have a bag some soil & fertilizer and then put the plant in bag And hang it on hand rail.Has any body try this? What would I use to make myself?

I have used pre mixed flowers in special plastic bags that work quite well but have never tried to do this with just a plastic bag. Even though I have bought this from a florist they still need lots of water.

Why don't you buy or order what you see and just do it that way. Sometimes money is saved just going with the original idea.

Or... just plant a Tomatoe Plant in a planter on your balcony. Container plants usually work out quite well if kept watered.