ok now beforre anyone flames you, tibed is seen as pretty much crap, as it places new entries at the bottom and... well people just dont like it much cuz notepads more controled and yeah....
but onto the topic:
To add a new voxel unit first you must add the rules entries
I reccommend you simply copy the entries from a similar tank as, like you said, you are a noob.. and this way mistakes are reduced..
Just make sure it has Turret=Yes if you want a turret :P
Then add it to the end of the vehicles list (Tibed does this automattically i believe)
Ok for this example lets set the image as DTNK (dingo tank)
Now for the ART entries
Ok it would look something like this
[DTNK]
Voxel=yes
Remapable=yes
Cameo=DTNKICO
AltCameo=DTNKUICO
PrimaryFireFLH=150,0,100
Ok now for the actual Voxels, you can make them in a few programs
http://downloads.cncnz.com/tibsun/utils/VXLSE_III_1.1a.exe]Voxel Section Editor v.III[/url]
and you might also want
http://downloads.cncnz.com/tibsun/utils/Install_CubeNormals_1.0.exe]Cube Normaliser[/url] to do a run-over the normals (what makes it look right in game)
i cant really give u that much advice on making them, but following my example id say you extract an existing voxel and a turret and a barrel of your choice and work with them from there.
To do this you must get
XCC Mixer
When your in it, open your ra2.mix (or ra2md.mix) then go to local.mix and select the VXL files you wish to edit and right click --> Extract and name em DTNK.VXL DTNKTUR.VXL and DTNKBARL.VXL
[EDIT]--- Hit Ctrl+Q to make the voxels look like they should in MIxer, im not sure if its neccesary cuz i do it out of habbit normally, but yeah ---[/EDIT]
Open em in Section editor and get to work.
When your good and satisfied run the cube normaliser and work its magic then you just insert em into your Ra2 directory (this is a noob tut so i wont say how to add em to your own .mix) oh and dont add em to the westwood .mix incase u were wondering.
Ok finally they need a .HVA you can extract the original ones and rename if you dont care about goodness, but for the sake of normalising and whatever, you should also download this proggy :
just download
http://downloads.cncnz.com/tibsun/utils/OSHVABUILDER_1.8.exe]HVA Builder[/url]
If ive missed anything or you need clarification just ask, and if someone else spots a mistake feel free to correct me