I want to pour a concrete shower floor over top of an existing sloping slab and lay ceramic tile that will be flush with the drain. I'll have to drill or hammer through the existing slab to install the drain pipe. Chief question is: what's the best technique to position the drain before I pour the new concrete? Also, what kind of drain and pipe is best in a concrete & tile shower floor?

You maybe best to just go to a tile company and buy you drain from them, also you can buy the liner you'll need. And most tile companys will have dvds on installation of there product

What we use is called detra