To import a model, please see the documentation here:
wiki:Importer and consult/seek help in the
Importer, tools & Utilities board.
After you finish importing and tweaking your model, you should export it as an otx package, to make the installation easy for other users.
To pack the model, please first create a thumbnail image for it, giving it the same name as the objdef, but with the gif extension. The thumbnail file should be a gif image in resolution 64x36.
Then, inside the game, go to the object window, select the model and press export. You will be asked to select the destination folder where the Outerra model package file will be written. The file name will be in the format
package.nickname.otx
The otx file contains your zipped model with all the necessary files. Anteworld registers itself as a handler of otx files, so other users just have to click on the file and let it be installed by Anteworld automatically.