I think that the best way to make this is to call a subroutine that ask the question.

if your button name for "next question" is BtnNextQuestion, the code like this :

sub Form_Load ()
LoadingQuestion
AskingQuestion
end sub

sub BtnNextQuestion_Click
AskingQuestion
end sub

Sub LoadingQuestion()
' put here the code to load all the questions
end sub

Sub AskingQuestion()
' put here the code to ask the next question
end sub