Strings Array? Collection? or List? Which one to use and how?

[pourkascheff]

Hi. Niya, This guy, encouraged me to overcome my embarrassment to post this thread cause It was out of private-message discussion. I might be a bit rusty in VB.NET so please do not judge me.

This thread can be divided in 2 ways of question making:

1) Can you redirect me topic links/snippets/codebank which covers making and working with different types of variables?
I already read Learn.Microsoft I know it is an elementary stuff but I always lack in principles (and also in english).

2) Or answer my questions individually here:
Lets begin with declaring lots of strings you want to add members to them. I saw somewhere

Dim BunchOfStrings() As String = {}

But there's no .Add or .Insert or something else to add a member.
Meanwhile is this particular way of declaring, it does:

Private BunchOfStrings As New Collection()

Why it should be private? Why it should be at the beginning right after class definition?
Also in this way:

Dim names As List(Of String) = {"John", "Mike"}.ToList

you can also add members like

names.Add("Mark")

But you may not get the entire list length like before .Length method (or even Len() ).
The goal is to read a CSV file and bypass the "put-them-all-in-a-DGV" stage and put them all in a 1 dimension or even multi dimension string, take its length, call a specific cell/member... Sounds simple at first, nightmare for me.

* I'm cool with different dictations based on different types in VB.NET. I wanna know... I want to learn
* I also want to do these add, remove, length, min, max, etc. supported-built-in functions on Strings, Bytes and maybe other types of variables (which I may deal with soon)