Convert LISP routine to VBA equivalent

Good afternoon.

I currently use a LISP routine to find the midpoints to 2 lines and
inserts an attribute block with values taken from the user in between
the midpoints of the two lines. I have just started to do VBA coding,
after recently starting VB.NET, so I am familiar with the language.
Here's what I need the routine to do:

1) get 3 values from the user (Lot, block and scale) and concat 2
values
2) get the midpoint between two lines midpoints
3) insert an attribute block populated with values taken from the user
4) loop the routine so the values autoincrement, but also give the
user a chance to change the lot/block values

I know that it seems that you all are doing the work, but I just need
an example to jump off from so I can see how the language works. I
would greatly appreciate any help the you can provide.

Thanks.
Jason.