What specifically is your question?
I want to know what I need to do to get connected
go through all the steps so I can connect the toliet and the sink and the drains.
Can you send me a picture or diagram of what is currently there?
There is a pipe where the old toliet was and the same with the sink and the drain.
What material is the pipe made of?
You can connect to the cast iron with a rubber coupling called a Fernco that has hose clamps that will tighten it to the pipe. You will need to check your local codes to see what type of material you can use for the new piping. PVC and ABS are the easiest to work with. Is the bathroom going back exactly where the old bathroom was?
No we will be putting the bathroom in the bedroom about 25 feet away.
You will want to hook onto the pipe at the old toilet and run a 3" line to the new bathroom. Cap off the old sink and tub lines. When you get the pipe to the new location, you will branch out to connect to the new fixtures.
The pipe will be extended underground to where the bathroom will be.
Make sure it slopes upward at 1/4" per foot going toward the new bathroom.
Will the toliet and sink and shower all hook up to the same drain.
They will all hook up to the same pipe.
Is that answering your question?
is there any videos that I can watch, being that this is my first plumbing job.
Let me get you some references. I'll be right back.
Better Homes & Gardens Plumbing is a good general reference for understanding how plumbing works and how to make simple installations. YOUTUBE has several videos, but without knowing your configuration, I can't point you to a specific one. If your configuration is the same as the bathroom you tore out, you could copy what was already installed. I can point you to some more references, but will need to see your proposed plan or sketch for the new bathroom.
Here are some videos from YOUTUBE.
I'd be happy to answer more specific questions about your particular install, but will need to see a layout.