VS 2012 List (Of T) String Array - Variable String Size

Hi,

I created a class 'Rule' with three string variables:

> ObjLst
> RuleLst
> ParamLst

Which get saved to a List(Of Rule) array.

Both ObjLst and RuleLst are single string variables but,
for each ObjLst and RuleLst there can be one or more ParamLst
variables[1..n].

1) How do I make a constructor for this sort of structure?
2) How do I add elements to the array - esp. the ParamLst
elements.
3) How do I get the individual elements - again, esp. the
ParamLst elements?

If needed to make it more clear, I can post snippets of my existing code.
Just let me know if it would be helpful.

Thanks For any help,
Grant