Hello, me again

Just a few more questions, when my colostrum arrives, how do i go about tandem feeding?

At the moment DS1 feeds on demand but is okay to wait when asked to.

So would i feed Newborn first and then offer to DS1? OR

Feed newborn from one side and DS1 from other side?

I just want to make sure Newborn gets all the colostrum he needs. Or is my body making twice as much so i should worry about this?