I would suggest you start with HTML
and then move on to JavaScript
VBScript would come after that.
EX:
<html><body><!--HTML HERE-->
<!--JAVASCRIPT STARTS BELOW-->
<script language="JavaScript">
//JAVASCRIPT HERE
</script>
<!--JAVASCRIPT ENDS HERE-->
<!--VBSCRIPT STARTS BELOW-->
<script language="VBScript">
'VBSCRIPT HERE
</script>
</body></html>