You can test for the next cell being empty by using:
If IsEmpty(ActiveCell.Offset(1,0)) Then MsgBox "Yup, it's empty"

You can call other macros when needed by using:
Call MacroName

If the macro you are calling has arguements, pass them as well:
Call MacroName(arguement1)

Branching macros wrote:
I am trying to create a branching macro that tests for certain conditions and
then proceeds to one or more macros that then sub branch to other macros. Is
there any way for a macro to take a relative address, go down one cell, and
test to see if the cell is blank, or contains text or values. And is it
possible to have a macro branch to a new one, do that macro and then return
to the same relative space and continue at that point in the macro function?