JSGME is a must when installing mods, you can find it here:
http://www.users.on.net/~jscones/software/products.html
For how to use it, check out
the link on my sig for a great guide.
If your mods do not come with instructions, check their
file configuration. For example:
Sobers 3d Waves ( Mod Name )\data\misc\peak.tga.
The above is the correct way a mod should look for JSGME. If the configuration is not correct, the mod will not work. All of this can be a little confusing at first but you will get the hand of it.
RDP