suggestions for textbox creation

[AssemblyBeginner]

hi everyone
  i need ur suggestions regarding to textbox implementaion like visual basic or turbo ide

some of points in my mind are:
# scroll up/down func 6h or 7h of int 10h for drawing textbox area
# func 0h of int 16h or getting char

how to do these task
# scrolling capabilites
# data capacity/limitation (max char)

and from ur sides
waiting for ur suggestions for pushing me in right direction