The drain for a toilet is best located at 12" from the finished wall to the center of the drain. The water supply depends on the toilet you select...no one location will fit all. The goal is to have it somewhat hidden, but still accessible. This is often somewhere between 5-8" left of center-line, but you really need to select the toilet first.
Sink supply lines again are dependent on the sink you select. It gets much more restrictive if you select something like a wall-mount sink or a pedestal. Otherwise, especially if it is under a vanity, it doesn't matter too much. Don't want it too high, and if it is too low, you'd need extensions for many faucets that have attached supply hoses.
So, select the fixtures first, then review their installation instructions. Otherwise, it's a crap shoot, you might get it to fit and look right, and you might not!