The languages supported within the Exhume debugger are Visual Basic Script (vbs) and Java Script (js).
I have never seen anyone write a bot in js, so look for vbs information.
Most tutorials you find will be for compiled visual basic (vba), but that is a good place to start for learning syntax. Just keep in mind vbs is more limited and won't support all the features of vba (goto statements, user-defined class inheritance hierarchys, etc.)
Syntax of vbs is very simple and you should be able to figure it out just by studying some scripts on this site. here are a couple links that may help:
http://www.w3schools.com/VBscript/default.asp
http://msdn.microsoft.com/en-us/library/y4wf33f0(VS.80).aspx
http://msdn.microsoft.com/en-us/library/ksh7h19t(VS.80).aspx
The VG boards actually are not dead, but there haven't been too many bots written. What is it that has needed tweaks? Slam666's UltraBot doesn't work "out of the box". He ported it to VG but it is buggy since it is basically the eq2 ultrabot with vg commands substituted and not designed for the quirks of vanguard.
Then there is my craft bot and mythicskunk's diplo bot, both should be fully functioning. A few other random simple bots are also present.
wyvernx will be reimplementing the vgewrapper, hopefully soon, so if you're more comfortable in C, you will be able to write your own stuff in visual studio.
Post if you have any more specific questions.