Building a new shower within drywall and pluming

How to start on the pluming

How to connect pipes to to create anew shower within the drywall

That is awefully vague. Is there nothing there at all right now? "within the drywall " can't picture what you mean.

building a new shower within drywall and pluming

how to start on the pluming
Hey Willie.
You start by figuring out what type of shower you want, Custom tile or plastic base and enclosure. If you have the tools and necessary skills you rough in the plumbing first. If you're concerned about doing the job get three estimates and pick the one you're most comfortable with. Good luck, Tom