You have quite a bit of planning yet to do. Is this a shower with a curb, or a drive in? You realize you must have a waterproof membrane on top of the concrete?
One conventional construcion method is to put down first a preslope mortar bed. This is because the floor of the shower must have slope from all corners towards the drain. Next a vinyl membrane goes down. The commonly used drain actually sandwiches this membrane between two flanges. This is so all the water which gets down to the membrane works its way over to and into the drain. Finally, another layer of mortar, and now the tile. You have to install the drain taking into account all this height. The good drains, the actual drain grid piece has at least two inches of thread, so there is some leeway.
There are other membrane systems available today. You need to do a lot of home work. There is an excellent tile help forum www.johnbridge.com
There is also an excellent book, " Handbook for Ceramic Tile Installation" from the Tile Council of America www.tileusa.com
They also publish the ANSI specs A108, A118,A136 in a nice book called " American National Standard Specifications for the Installation of Ceramic Tile"
I have enjoyed doing a lot of tile work at home as DIY projects, but I did the research first. A tile project is something which should last 30 years + in your home. But if you don't follow Mike Holmes advice to 'do it right the first time' then Mike will be visiting your house in a year to tear it all out for mold remediation!!!